Is it possible to replace iPhone 4 camera with iPhone 4s's one?

Well, I have quite an old iphone 4, maybe 1,5 years old and first thing is that I don't like it's LED flash, in comparsion with newer models it's kind of yellow or even green, so all photos with it are comming with "greenery". So i thought I should find some camera module on Ebay (also, afraid to buy bad copy, don't even know how much should it cost). Second though was - is it even possible to change iPhone 4 and 4S cameras? Well, yes, I think there will be certain software problems (maybe not so critical?), but is it possible in hardware? Maybe you guys from iFixit would like to try it? =)