You are right about the Hyper P Dope Mix for sure.
As for the Jazz Stash mix, you’re only right if it ended up being edited for the Japanese release. But I have no idea since I have never heard that version.
Kibbles and Bits on Dope Dog appears to be exactly what is on the Japanese version: http://mother.pfunkarchive.com/motherpage/albums_gcpfas/alb-dopedogsjv.html
Fast Dope is the basis for Pack of Wild Dogs, but it’s short.
So in conclusion, it appears that only the hyper mix and kibbles and bits would be redundant to someone who has all three Dope Dogs releases. If you’re me and you have just the UK and US, then there’s only one redundant track. It was painful to buy it, but I couldn’t stand the thought of waiting 2-3 more years for another one to show up, at god-knows-what-price.