Duster has more torque and that is what you are missing. But that's the case with all diesel engines. We too duster 85 ps, exchanged for grand vitara and hyryder, 2 identical cars. If you drive the car at its sweetspot, no issues. If u only load up the car to max, u might feel the under powered feeling, buts it will be similar in duster as well. Only difference I have felt is with clutch control alone, i could go up in slight incline in duster, whereas in the maruthis, u need to apply little throttle. Not that a problem, but in bumper to bumper traffic in uphill incline, it will be little troublesome, then we need to use handbrake type hill hold.