Like said above, they are 99.9% identical. Template is identical.
The only possible variance could be 1) the cant is built into the future fins so that may be different then your fcs, being that fcs systems have the cant in the fin plug. 2) the k2.1's have an intentionally stiff center fin, but the difference in flex pattern is negligible, especially if you get the WCT in solid glass. But all said we are getting into the niddy gritty and most people wouldnt notice the difference between the wct and k2.1
We can talk all day , but the only way to really know is to try a template out...Your local shop should have a test drive center or fin tree... allows you to demo fin sets free. An online retailer has a "fin addict " program... like netflix for fins .