I think the K0 and K1 rotors are much the same with the square shoulder on the inside edge of the alloy, always worth a look , on a caliper with a badly worn hinge the caliper can sit on disc shoulder here and wear it down,
the later discs K2 on were tapered here..TC
I sold my first Sandcast and regretted it till I bought it back 6958/7149, its taken a few years to get a couple more 6946/7169, and 6970/E6956