If you’re certain that only the housing of the connector has changed from old motor to new motor, and each pin inside the housing is the same, then I’d recommend trying a heat gun to melt the waxy adhesive, followed by poking around with a screwdriver to unlatch the pins.

But if it were me, I’d just splice the wires. You will need heatshrink or at least electrical tape, a soldering iron, and solder. A good splice can easily handle more current than that little connector.