Buying a new logic board?

hey bought coke spilled macbook 2008 ebay..opened , soaking in isopropal speak must admit isnt looking good..

new macs wondering part buy.. have late 2008 model a1278 when im looking logic boards online see mid 2010 models etc. same model number mine.. question mid 2010 work 2008 model or what?

im confused why use same model number on different years

please me out!

 

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