1969 Boss 302 rotors/spindles

OK. A guy sells the 2 piece 1970 boss 302 rotors(not the 200 each variety Branda sells). He claims there is no difference between these and the 1969 models used on late Shelbys with XHD suspension with the F-60s. My original spindles carry a D0Z engineering number and they -along with my large bearing rotors are original to my car verified by my eminger factory invoice and order form. whats up? Can I use those 1970s and put my original ones away? Gary