Only in 94 was the tape deck offered with CD Control in the SC. In 95, CD only. If you had the tape deck without CD, it was standard, if you had the CD CH, it was premium. If you had the 95 CD, more than likely premium. As for changeability, its either standard or premium, and yes, they are interchangeable. The 94-97 mustangs, probes and the taurus pre 96 were the same systems, either premium or standard. In 98 the mustangs got the amp under the radio, which sucked to bypass, but only if it was the mach system. And the 96+ taurus speaks for itself with the seperate tuner box and football shaped radio.