Hi Siddharth,
As you know, during the retrofit we have three options - Auto Import, Semi automatic and Manual changes.
From my perspective, only the Auto- import requests go to Production again, but there is a possibility that these objects may also get changed in the Impl dev after retrofitted as part of project.
For Semi automatic and Manual changes - the object has already modified in Implementation dev system and these modified objects go to Production.
Regards,
Vijay