Forgot I had these on my phone but will do a better comparison over the weekend

The only difference I can see is this cut out – clearly the MC16 won’t fit an 18 as the water ducting is too small but going the other way 18 on a 16 should be fine
I will also check the screw holes for frame mounts


MC18 right hand panel



MC16 right hand panel

_________________
Nick

Rebuild project NSR250 MC18 R4J