Adsense on Blogger - same HTML or different?

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when putting Adsense on BLogger - is it best to use the same html code for the adsense ad on ALL blogs you might have or should you use a different html code per blog? I have been doing Adsense for few years and for some reason (forget now) I started doing that but now wonder why. In a way I don't care where my traffic comes from, i do the same promotions all the time and do okay. (Although probably something I should work on improving, but I have to figure what I am doing first!) But at the same time, I want the maximum clicks and credits from the ads to my Adsense account. Where a page view or click came from is not really the issue...just that it gets the credit it should at Adsense. I am in the process of re-vamping my blogs so I want to change this now if it is something I should do to better my preformance with adsense Any suggestions or comments?