iMac RAM question

[Crysis]

I have a quite simple question
What's the difference between Mac RAM and normal SO-DIMM RAM? (200-pin 667MHz PC-5300)

http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/wa/RSLID?nclm=9AED2EE7

OR

http://www.komplett.co.uk/k/ki.aspx?sku=317342&view=detailed#ProductTabs

Could I use normal SO-DIMM RAM in my iMac?

Edit: NVM, got it sorted

Could someone close/delete this thread? Thanks