Nope, just the same old regular Royal Guard look and armor.
The only examples of EUP-guard ponies not part of the royal guard I can think of are:
The Wonderbolts, obviously
Lunar guards, or bat ponies, from Luna Eclipsed. Not officially named.
Night guards, from It's About Time. Also not officially named. They wear a dark armor closer to the lunar guard uniform than the royal guard one, but it's not identical, and borrows a few royal guard pieces, and wears Celestia's star as the insignia instead of Luna's moon.
Crystal guards, who, while technically independent, are pretty much so deeply in bed with Equestria that they might as well be a part.
If these other guards exist, why don't you provide a picture? Having watched the wedding scene several times now I can't spot any.