In Europe and the rest of the world that adopts the metric system, tables have 16mm holes spaced on 50mm centers. In the US and countries that work off the Imperial system, we build tables with the same sized holes on 2” centers. Technically, 2” = 50.8mm.
And No, it doesn’t matter.
The spacing of the holes means nothing at all. The main reason they are roughly spaced this far apart is to ensure that when you need to mount a tool to the table, you can basically reach every square inch of it. The same tools will fit in tables with spacing of 50mm or 2”, because the holes are identical.