The Tactical sport is a completely different slide, frame and magazine than the SP-01. Can't imagine how it can be considered an SP-01 "variant" as it doesn't seem to be in any way.
I always wonder why the Tacsport, Orange, Chechmate, IPSC, etc. don't have their own forum. I never know where to look as it doesn't fit in any of the categories listed.
They deserve their own forum, imo.