Identical to the standard RWS 34 except for the plastic stock. I love my 34, although on a hunt it is a little bit on the heavy side, weighing 7.5lbs. I can't seem to find a weight on the Panther, but I would assume it is lighter. I'll have to check one out sometime.
My 34 seems to like a bit heavier pellet, 9.3gr. Beeman's doing the best for me. Anything much lighter and it seems to scatter them all over the target at 35yds. Because of the weight (and a bit of shakiness on my part due to some meds I'm on) I use shooting sticks and am able to get 1" groups at 35yds fairly consistently. I don't have a chrono, but the lead that's left in the trap is VERY flat/splintered at that distance, even with the 9.3gr. pellet.