Чем отличаются два ConstraintLayout для 4 кнопок изображения в Android Studio?

Question

Я использую ConstraintLayout в своем проекте Android, я помещаю четыре кнопки изображения в пользовательском интерфейсе, я надеюсь, что расстояние между 4 кнопками изображения равно расстоянию, кажется, что обе Layout A и Макет B может сделать это, вы можете увидеть результат Изображение AB .

Чем отличаются Макет A и МакетB ?

Макет A

<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/camera_ui_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <ImageButton
            android:id="@+id/btnFlash"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginLeft="@dimen/margin_xsmall"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintHorizontal_chainStyle="spread_inside"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toLeftOf="@+id/btnVideo"
            app:srcCompat="@drawable/ic_flash_on" />

    <ImageButton
            android:id="@+id/btnVideo"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/btnFlash"
            app:layout_constraintRight_toLeftOf="@+id/btnPicture"
            app:srcCompat="@drawable/ic_menu" />


    <ImageButton
            android:id="@+id/btnPicture"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/btnVideo"
            app:layout_constraintRight_toLeftOf="@+id/btnAction"
            app:srcCompat="@drawable/ic_menu" />

    <ImageButton
            android:id="@+id/btnAction"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginRight="@dimen/margin_xsmall"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/btnPicture"
            app:srcCompat="@drawable/ic_menu" />


</androidx.constraintlayout.widget.ConstraintLayout>

Макет B

<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/camera_ui_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <ImageButton
            android:id="@+id/btnFlash"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginLeft="@dimen/margin_xsmall"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintHorizontal_chainStyle="spread_inside"
            app:layout_constraintLeft_toLeftOf="parent"
            app:srcCompat="@drawable/ic_flash_on" />

    <ImageButton
            android:id="@+id/btnVideo"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/btnFlash"
            app:layout_constraintRight_toLeftOf="@+id/btnPicture"
            app:srcCompat="@drawable/ic_menu" />


    <ImageButton
            android:id="@+id/btnPicture"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toRightOf="@+id/btnVideo"
            app:layout_constraintRight_toLeftOf="@+id/btnAction"
            app:srcCompat="@drawable/ic_menu" />

    <ImageButton
            android:id="@+id/btnAction"
            android:layout_width="@dimen/round_button_medium"
            android:layout_height="@dimen/round_button_medium"
            android:layout_marginRight="@dimen/margin_xsmall"
            android:layout_marginBottom="@dimen/margin_medium"
            android:background="@android:color/transparent"
            android:scaleType="fitCenter"

            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:srcCompat="@drawable/ic_menu" />



</androidx.constraintlayout.widget.ConstraintLayout>

Изображение AB