That 330m comes in two versions (PGA or BGA). If it's PGA then it's fitted in a G1 socket and can be replaced. If it's a BGA version ...it'll be soldered and thus not replaceable.
So ... if you have the PGA version ... my best guess is that the 620M will work (note that it is an i7 not an i3) ... same socket ... same thermals ... same microarchitecture. There's no quarantees when it comes to swapping processors though but ... it does look promising.