Is it OK that I have got different CTR with same banners on the same geo's?
Thats what I noticed by souces Traffic Factory CTR > Traffic Junky CTR > TrafficStars CTR
The difference is pretty common when you test the same creatives on different traffic sources.
Factors like banner placements, total traffic inventory as well as audience may influence a lot on the the ctr performance.
You mean different CTRs on different sources? Yup, that's perfectly normal.
Every site has somewhat different audience, which results in different results both in terms of CTR and offer conversions.