Yet another update:
After a long period of playing of PS97, I tried the Response97 yesterday - I made sure I had same string and tension on both. I used a hybrid poly on mains and syn gut on crosses at 20Kg vs 19Kg respectively.
In terms of final weight, they were 2 grams apart - no lead anywhere.
Although very very similar on paper specs, they feel completely different on court.
Somewhat opposite to what
@Lukhas felt, I found that one was very whippy in relation to the other thus also lacked mass in certain shots, also felt lighter and more maneuverable.
Strangely while I felt the racket lacked mass and the shot was not as heavy as with the other one... my sparring partner said the shot with the whippier racket had a lot more action on it... it sort of accelerated after the bounce...
With one I could flick and / or accelerate the racket head much faster than with the other - but I had to put my body weight on it and in proper position. The other allowed more leeway in that.
With the other I felt I could just clobber the ball, or in defensive shots just let the racket's mass do the defensive sort of work on the ball, with the other it certainly lacked the mass on the same kinds of shots, but I could flick it - so it allowed for a different kind of defense.
On serve the flick vs clobber allowed for completely different serve attitudes... I could relax and flick a relaxed spin serve that I could not with the other.
With the clobberer sort of everything was solid and I could somewhat slack of on proper body position, not the the "light" whippy one...
I'm not choosing which one is better, it's a compromise, with either one you gain some you loose some, you get to choose what's better for you.
BTW, whippier = Response 97, Clobberer = PS 97