XR400R carb

[Chanman420q]

i just checked hondas web site and the XR400 carb is 36mm and the TRX400 is 35.5, now i know where talking about half a milimeter, but would it make a noticeable diffrance if u were able to pick one up cheap?

i just checked the XR650R and they have a 40mm, would that beable to hook up without tweaking much