Of course I had to do a comparison with Slamming Red, and while I was at it I pulled out it's close sibling, Purple Medallion.
On the nail, Rudolf and Slamming Red looked pretty darn similar. The texture was exactly the same as far as I could tell. I fancied I could see a slight color difference, with Slamming Red being redder, but that could just be normal variation in batches as well.
Purple Medallion has sparser glitter and a darker, more plummy base.
The base color difference shows up best in really bright light, like that of a camera flash.
As far as I'm concerned Rudolf might as well be Slamming Red; if I see any on clearance after Christmas I'll snap them up for swapping, but I suspect they'll all be gone by the time I get back to the store after my holiday break.