Welcome aboard, MastarArcade.
It looks like the standard Nintendo buttons are 1 1/16" (~27mm) as opposed to what seems to be normal 35mm.
The first important measurement for buttons is the mounting hole diameter.
The normal size for arcade pushbutton holes is 1 1/8" (~28mm) -- some Japanese buttons use 30mm holes.
Not sure where you got 35mm from -- sounds too large for the hole but it may be the size of the button bezel. (top of the body)

Standard 1 1/8" Happ/IL button bezels are ~33mm.
As long as the button bezel covers the mounting hole, it will look fine.
Scott