Better specifications than the orginal: 7.5 amps cold versus 5 amps, 3.5 amps hot versus 2.5 amps. 1.2 ohms versus 2.4 ohms when switched on. Less resistance means less heat. Power = I*R^2. So when hot: The old one would need to dissipate 14.4 watts at 2.5 amp draw. The new one would dissipate 3.6 watts--so it will not get as hot and last longer.

Make sure you get the correct legs into the holes on the circuit board. Check the cutsheets for the leg arrangements. That is most important. Use some heat paste between the mosfet and the heat sink. Not too much, but enough to cover with a thin layer.