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The stack height is determined by the height of the black 3-4hole adapter/shim thing.
If they changed the height of the yellow part or the c-spring it wouldn't engage properly. The height of the retaining metal piece is lower - but that has no effect on the stack height.Holding my v2 3-4 hole adapter up to aero one they appear to be the same height.
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They've changed every part. I don't know how though, which is why i ask. Obviously they can't do too much coz it has to work with existing pedals but you never know with a redesign if they've found a way to remove a bit here and there. Stack height same = good. I can't find any V2s to replace mine with so it looks like I've gotta cough up the £50 for these stupid cleats.
I have no idea, that's why I asked. They appear to be a completely different cleat so there's every possibility stack height may have been altered.
Better comparison
https://www.remo-knops.com/7310/how-to-install-speedplay-walkable-cleats/