All I know is the later RB25 one's (3 pin connector) max out at 5v @ ~ 290 hp on the gts. The code is 22680 31u00 try and avoid this one. The earlier ones are fine / and rated @ much higher HP, will also connect directly onto the standard connector. All the RB25 AFM'S have a pink label.
The Z32 one's have a different wiring connector aswell, their part code is 22680 02u00 and always has a green label.
You can easily swap the connector's over by prizing the cover open as long as you re-seal it good afterwoods, done this with mine leaves things looking much tidier.
The software should be here tomorrow Pete, Give me something to play with this weekend