your best bet might be to wait until someone can give you a definite answer, but i dont think many people will be willing to take their ecu apart. honestly id take a bit of a stab at it. if all the other similar-looking resistors all have the same resistance value, i'd go ahead and chuck one in.
i dont know much about resistor wattage interchangeability, but in theory, one could place a higher wattage resistor in the circuit without causing an issue... hopefully