Interesting! I did a search for rapeseed stearic acid before posting but couldn't find anything except sources from Europe. I guess you guys are lucky in this regard.Yes. But in this case, I'd say it's pretty safe to assume it is. Knowing from which oil it is derived is at least as good than knowing the P/S portions.
Of the “cheap” oils, only palm, rice bran & cottonseed oil and animal fats contain major amounts of 3palmitic acid. For everything else, it is very reasonable to calculate with pure stearic acid (93% S & 4% P for rapeseed).