cpxinteractive, adsense and flash ads

I have got a question regarding running cpx and adsense. I gather that its allowed. However the TOS of google says that the publisher should ensure the two ads don’t look similar.
Now if its a text based ad(like adbrite say) i think you can change the colours etc to make it look different to adsense. However, how does one ensure that the ads look different when both are serving flash ads?
Both google and cpx ads are indistinguishable when adsense serves a flash based ad(which it does quite a lot on my site). Is that ok? Anyone else has any experience with this?

Original post by Artistic