Replace A1286 Mid 2009 Logic board with a mid 2010 one?

I've looked deep into this over the course of the past 2 months, and I've came to the conclusion that all of the connectors and components between the Mid 2009 C2D logic board and the Mid 2010 Core i7-620m logic boards are identical, except for the heat sink, bluetooth and wifi board, and isight/antenna cables. All of the screw holes line up (they are both a1286 model number) and both use a nvidia chipset, so it seems the screen would work correctly without any modifications or additional parts.

I'm just wondering, what would the killer be when buying a mid 2010 logic board (with a core i7), a new isight/antenna cable, and a new bluetooth/wifi board and upgrading my computer this way rather than buying a newer macbook pro.