Replacing a Boost Converter MOSFET
Given what you have provided, there is simply no way to tell. 

On the one hand, your replacement FET has a nominal Rds(on) about 30% lower than the original, which means it should (all things being equal) dissipate about 30% less power. But, of course, not all things are equal. As Tony Stewart commented, the replacement FET input capacitance is nearly 3 times greater. This means that it's entirely possible that the gate driver will not provide a fast enough turn-on and turn-off, and dynamic heating may be much greater. Or maybe not. Without details of the gate drive it's all a big mystery.

And just as a passing comment, beefing up traces with solder isn't that effective, since the bulk resistivity of solder is about 10 times that of copper. You'll get better results if you lay down bare copper wire on the trace and solder that in place.