GM dealer tech here, we use GM EPC(Electronic Parts Catalog) to find out what filter we suppose to put on.
UPF63R is basically exclusive to GM 3.6 v6 engines, I cannot remeber any other engine calls for that.
But the UPF63R is for sure a very premium filter, it is much heavier than the regular PF63.
Other than price difference and availability (last year during the UAW strike even the supply of oil filter was interrupted for few weeks here in Canada, UPF63R is not something we keep in stock a lot so I had to use PF63 few times), I would use it on my own truck no question.