The WPSiteSync for Advanced Custom Fields add-on allows you to create complex Content with ACF and have that synchronized between your sites. When synchronizing Content, any references to images, taxonomies, posts/pages (relationshipts), users, and so on will be updated to the correct image, relationship, etc. on the Target site.
Please note: WPSiteSync for ACF supports the ACF plugin available in the WordPress repository. ACF Pro stores data differently and is not currently supported. We are in development on a version that will support both ACF and ACF Pro.