Alex,
You have two answers to your question:
Technical Side:
No problem. You can import a request for a lower version into a new release, but keep award about the Version Component Restriction in STMS.
Functional Side:
Yes, you can have a problem. You need to be award about the kind of object of your request.
If they are only Customer Objects (Z*/Y*) you are not going to have maior problems. You only need to ask an ABAP to validate the imported objects in case of some syntax or activation error. Remember you can have differences in the original objects your abap may can be referenced.
If you have standard objects you can have a serious trouble. It dependes of the object you overwrite.
Regards,
David