Small differences in a rackets weight, weight distribution, stiffness, stiffness distribution ao can make it feel very different. Even the same model, because of qc. Perhaps you could make the new racket feel less boardy by adding a bit of weight at 12, at the top of the grip, or on/in the butt.
If for instance the new racket is lighter and more head heavy than the old, you could add a few grams of weight at the butt, in my experience you would get a softer feel...
Wilson PS Classic, Gosen OG Micro 16, 26 kg.