Need help with Adsense ads on blogs - use the same one or different

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Searched for an interest for "google Adsense" but found most come to this category.. so I will too. I have several blogs. At first I was creating a seperate Adsense ad on Adsense to put on each blog and trying to learn how to follow the traffic but still haven't been able to figure that out... but after adding so many blogs, I started just copy and paste the HTML for the adsense ad that I had on another blog and put it on the new blog. However by doing this, I don' have a seperate "channel" link thing to be on the Adsesne reports...but would think that no matter where the ad is...the report would pull all page impressions from the ad. Or am I wrong about that? And I also know that by doing it this way, I don't have clear knowledge of where the page impressions are coming from which blog, and that might be a problem...thoughts? Now I see the page impression are pretty good on some of them... but still... the monitary results are next to nothing. So far $1.26 for august, yet I see the charts that seem to show lots of page impressions. So my question is...is it better to have an Adsense ad HTML different for each individual blog? Or is that even an option...the HTML has my account info in it..unless that changes with each and every HTML ad I create? Anyone have any comments or answers to help me understand this? Thanks for any comments!