There are new Chitika ad format that look like Google Adsense. It may be acceptable to Chitika, but the question is: will the mighty Google allow it?
here the quote from chitika FAQ page : "Chitika cannot speak on Google's behalf. However, some of our clients who have contacted Google have been informed that it is ok to use Chitika ads with Google Adsense when used in non-contextual mode (1, 2). By default, the Chitika ad code is set to be non-contextual."
There is no mention in TOS of Adsense. Moreover both of them are different in their presentation. So it is no problem to float both them in a same page.