using same addressfield for profile2 and commerce module
Profile2 and Commerce Customer Profiles are different entities. 

Even if the address field is the same, the data will need to be copied over somehow.

One way to do it would be with 

hook_field_attach_load

and load in the relevant address field data there, when the field is loaded.

Keep in mind:


That hook can be passed multiple entities
Ensure the user id for both entities is identical prior to merging the data.


More info on the Field Attach API