Whilst it is not 'ideal' to have 'different' ESC's on multis, you can get away with it.
Personally I would not fly like it long term, but have experimented with four different ESC's on a cheap 450flamewheel/KK2.1.5 once (1xAfro 20A, 1xFlyFun 20A, 1xEMAX 20A and 1x eBay random yellow 25A thing). It worked - but was not as stable as having all four the same.
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Personally I would not fly like it long term, but have experimented with four different ESC's on a cheap 450flamewheel/KK2.1.5 once (1xAfro 20A, 1xFlyFun 20A, 1xEMAX 20A and 1x eBay random yellow 25A thing). It worked - but was not as stable as having all four the same.