On its own, PC Plat is certainly not equivalent to Hyatt or Hilton Diamond, or SPG Platinum. RA maybe, but the others would only give you top tier if you had the same number of stays last year with PC as is required for their respective tier. Since one can earn PC Plat with a couple of stays and some bonuses, you'd have to show at least 25 stays or 40/50 nights depending upon the program you're wanting to status match.