If you're interested in variations of the France 2 cents 1999:

I have to say they go very far in that catalog, but they don't mention anything about the position of the mint mark (high - low), only about the orientation of the bee mint mark, but maybe that's what you've read somewhere.
There's also a website with everything about the euro but not everything is accessible if you're not a member. The variations are not accessible for instance, but the pictures are much better than in the catalog, https://www.amisdeleuro.org/fr/150
The combination of the different obverses, reverses and positions give 12 different variations, as you can see on the website too:

They all have a detailed sheet, but again only visible for members.
By the way, there's a big coin fair in Houten again on Saturday 19 April, maybe I'll see you again there.