Power supply replacement

I have a customer who brought in thier computer, as it was not booting. Upon inspection, I quickly realized that the problem was with the power supply. A fuse in the power supply is blown, and the board in the power supply has been scorched.
I tried to find a power supply with the same peramaters as the old one. The old one was 120W, and the closest I can find is 150W.
I could probably find one elseware, but my company is very particular as to where they order parts from.
Does anyone knowif this will cause any problems?