ACF will pick up on it if 1) the data in the database is the same and this needs to be a serialized array 2) the meta_key value is the same and 3) the acf field key entry exists in the database for the post.
Let’s say the field name is “gallery” the database must have to entries for the post:
post_id meta_key meta_value
100 gallery {SERIALIZED ARRAY}
100 _gallery field_123456789abcd
