Dust minis are closer in dimension to 1/48 scale, (it's what they're marketed as being) but they're not quite as thin looking as the more scale accurate Tamiya stuff, which imo makes them look a bit big compared to SotTR minis (the mechs however look fine). so, in answer to your question, they look fine next to Tamiya figures, just a little chunkier,
Hope this helps.