eracode:

tchart: 

I think you missed the part where the existing wiring is being moved to the new switch and the old switch being disabled.

So yes like for like but physical constraints mean the new switch will be in a slightly different position.

Otherwise that some cowboy level renovations

Anyway regardless OP was referring to CoC which is not required. ESC is.

 

I think you missed the part where I said (as OP) that a dimmer is being introduced into the circuit - and that means it's not 'like for like' - as @John19612 correctly pointed out. It's not as simple as just a "new switch in a slightly different position".