I haven't seen the internals of your rifle so I couldn't say for sure if it's the same power plant,,, but I'd be willing to take a guess and say it probably is.
As for the tune kit,,,, it's actually listed as a QF-2 cleaning kit designed for the B3 series rifles. It comes with a new spring, breach seals and a synthetic piston seal. I used the same kit when I did the tunes on my three B3 rifles and the improvement was dramatic to say the least.... You can pick them up at SouthSummit for about 8 bucks.....
Jeff