Currently it seems you can only export/import ACF structure, the actual custom fields setup, however, it would be nice if you were also able to export actual ACF data, such as from the options page, or pages themselves.
As illustrated here some time back:
https://support.advancedcustomfields.com/forums/topic/exportingimporting-field-values-between-installations/
Doesn’t seem this has gotten anywhere, and the only solutions currently seem doing it manually by going into the DB.
This plugin might help you. You can export and import many field data along with images, taxonomy, and options.
https://wordpress.org/plugins/simple-export-import-for-acf-data/
