interesting question
I suspect the port spacing would be the same, so the Exhaust manifold should be ok, but then what flange is fitted? U'd have to use the megane turbo and is there clearance? As for pistons, doubt it.
iirc Megane block is more like a 197 block so not compatible with 1*2 length gearboxes??? so won't fit.
This is mostly pissed speculation