Product Import Issue

Hi

We have a product named Plan R which has row_id='1-GW09' in Dev environment. But previously the name of the product was Plan1 and we had imported that product in testing environment and it exists there with the same row id '1-GW09'. Now when we are trying to import the product again from dev environment to testing environment we are getting conflict error that object_num already exists in the destination environment with name Plan 1. I am only trying to import the object xml of the product. We have more than 50 such products where the names have been changed but