Instead of right clicking in explorer, right click from the Start11 menu itself and pick Pin file. Does this then allow you to have two separate links?
No, it just overwrites the "older" with the "newer" one.
I did now a Workaround and made 2 separate LNK-Files for each Cinebench.exe, named it differently and only THEN I've added it to Start11.
The "default" Windows 11 and Windows 10 Start Menu, on the other hand, can handle "same Exe file name" from different locations!