Edge of peg hole in 11458 too thin?

[Jaco van der Molen]

They are not the same diameter... 11458 diameter is 7.4mm (radius 9.25 ldu) while nipple tile is 7.85mm (radius 9.8ldu). and models are rounded down to 9 ldu for 11458 and up to 10 ldu for 20482.

How can this be? I now have the parts here in my hands and if you look close you can see a very slight difference, but certainly not 0.45 mm?
Rubbing your nail over it you can feel it. The same goes for the edge I mentioned earlier.
   

Using the same color for 11458 and 20482 viewed from a distance the difference is neglectable IMHO.

However, I have a very strong feeling that 75535 and 62462 are really the same diameter.
I have those now in my hands too, connected with a pin and I can feel nor see no difference.