This may be something that gets added to ACF. I know that the developer is thinking about it.
There are some current options.
ACF4: https://github.com/theideabureau/acf-reusable-group-field
ACF ?: https://github.com/tybruffy/ACF-Reusable-Field-Group/ there are several forks of this one, I’m not sure which on to use.
There is also mine that works with ACF5: https://github.com/Hube2/acf-reusable-field-group-field
and I have this one that has a field group duplicator if you enable it that will copy field groups to multiple options pages: https://github.com/Hube2/acf-options-page-adder
and there is this one that lets you build field groups with code that will also let you share fields in multiple groups. https://github.com/fewagency/fewbricks
