Swapping tranny on 98 sl500 for........

I have a 98 SL500 and the tranny is starting to stall 2 seconds when going from reverse to park or drive. I have a 94 SL500 that I could use or a 98CL500 that I could use to swap. Will either of these fit? I prefer to use the 94SL500 if I can. If neither option will work is there an internet website that sells them? Also, there is a growling noise coming from the front. Not a grinding (metal on metal). I just had the brakes and rotors replaced and they work great but, this noise isn't from them (I don't think). Any help is greatly appreciated.

Thanks,
Sam