As I mentioned, panasonic brought sanyo. The sanyo datasheets are now hosted under panasonic’s name. The original UR14500P datasheet.
But they are still sold as sanyos. Did you check with Orbtronic? Since you were talking about Orbtronic using those cells. 14500 Battery 3.7V Li-ion 1100mAh World's Highest Capacity FREE battery Holder They seems to think UR14500P are sanyos.
Keeppower, Evva and Orbtronic are all just rewappers who add protection. Keeppower will also sell chinese cells rewapped with protection, you just need to pay attention to what you are buying.