Use in_array(), like this:
$search = [ 'AAA', 'BBB', 'CCC', 'DDD' ];
$meta = get_post_meta( $post->ID, 'MY_CUSTOM_KEY_A', true );
if ( in_array( $meta, $search ) ) {
update_post_meta( $post->ID, 'MY_CUSTOM_KEY_B', 'ZZZ' );
}
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