No idea what that "prototype adapter" does; however, if the Rejuvenator is made for using a 8372(A)B, the 318069-10 won't work. You need one that fits the A3000, ie 318069-03, 318069-18 or 318069-19.
The 318069-10 is for the A500+ and some A500/2000 "megichip" (or similar) adapters.
It's all in the list I posted (which is wrong in one particular point: The 390544-0x sure don't fit the A3000, if they are also for the A500. Those two need a different pin layout.)