Merging Name Mapping

Hi,



I am having a project suite, in which I have 3 projects(P1,P2,P3).



P1/P2 will have few name mappings as common and other than that, all the name mapping are different. So, We have mapped everything new, even the common things..



For P3, We are using script from both P1/P2. My query is, Is merging will create problem.Is there any other way other than merging the name mapping..



Thanks in Advance