The short answer to your question is only reporting would be affected and nothing else.
Changing project type does not change any of the other actions within the request process. In fact if you change the request type to another project type that has its own nested workflow it is required to go through the manual staff of a signing into that work flow.
Our philosopy as to why that is centers on the thought that certain workflow steps may have occurred that have prompted the change in project type. Therefore, we want those workflow steps to finish so as to fully capture any reasoning behind it.
Remember that if you reassign a request to another project type it will not automatically flow into any default workflow.