I want to know about adsense ads that I've managed 2sites so can i post a single ad code in both site? because both site for different niche's. and get any difference in CPC?
If you are putting same adsense code in high value niche and low value niche It will effect high value niche. In overall calculation, adsense will reduce the cpc for high value niche
No problem. You can put the same code on different site, it wouldn't affect the CPC The only disadvantage is you can't track the individual ads unit performance