Motherboard Upgrade

Hi, I know laptops are not easily upgradable, however, I have been lucky enough to have the ability to upgrade all my previously owned laptop Cpu's. The question I have is would I be able to use the Inspiron N5110 motherboard inside my sons Inspiron M5110? The  boards and chassis' are identical except the N5110 has a better nvidia graphics card. I have to replace his M5110 motherboard anyway since the northbridge requires a reflow which i usually fix with the oven set to 180 degrees for ten minutes. Not the perfect answer but fixes for a while :). Any knowledgeable help would be appreciate if anyone is familiar with theses two machines. Was going to take the gamble n just go for it but thought a nice Dell assistant could help me out with some facts :).