Wat, I'm pretty sure that the original Orbit 1 could be used with either but required removal/bypass of the Phase shift capacitor. The original Orbit was, IIRC, a single speed unit.
Then came the revised Orbit 1 and the Orbit 2; Both offered switchable 33.3/45rpm, the Orbit 1 coming with it's own little PCB for connecting to the motor, whereas the Orbit 2 you could just plug your Airpax/Premotec/Philips motored deck straight in. It's said that the Orbit 1 had the performance edge but was more tricky to install.