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The Wow minis are a bit larger, so no the scale isn't quite right. The minis themselves are high quality but they have the WoW cartoonish style paint jobs. Not my taste personally.
Significantly larger but also much higher quality. You couldn't mix'n'match really and would probably want to use 1.5" squares, but if you were gonna go all out and buy only WoW minis, the minis are quite nice.