Just remember that Single Pilot Aircraft rating and Multi Pilot Aircraft Rating are different. If your IR is SPA then it can't be revalidated by your MPA IR. The are independent. As for your MEP rating the MEP is a single pilot aircraft, therefore you can renew the MEP and SPA IR in one test. The MPA Type rating (Turbo prop) will allow you to renew your MPA IR at the same time.
I think that makes sense....?