A quick comparison between the rutracker rip and an r1 dvd rip - the pal dvd they used is indeed way better than the us one.
I'd say it was worth it trying to track an r2 dvd down if you're really looking for a better version. They don't specify on rutracker what specific r2 dvd was used though, as far as I can see.
There are German (der tapfere kleine toaster) and Polish (dzielny maly toster) dvds that can be had quite cheap(ish), however they may be a different transfer.