Do you know the specs for your PST 3rd gen and the 1st gen when you used that one? I
I do not check the specs myself. I just look at what TW publishes before I demo or buy racquets. I usually have 3-4 racquets of the Babolat model that I play with that I take to matches and varying specs has never been an issue for me. If there are minor differences in specs, I probably just adapt to it during the warmup.
I would rather focus on what my opponent is doing than minor differences between the specs of different racquets of the same model that I have. If I can’t adjust to minor differences in racquet specs, how am I going to cope with slightly different string tensions, temperature/wind changes, ball getting old, different ball types, glare/shade issues etc. that affect a match? That’s been my philosophy while I played with the Max200G, Sting, Pure Control, AeroPro Control, AeroStorm Tour GT, PST Gen 1 and Gen 3 over the years.