I don't think so. It was the same time period, but girlxpert was based in the Czech Republik, while Athens-Girls was run by a greek guy. Both sites did not feature the same girls. I think Athens-Girls had a sister site called AG-Angels and was run by a man named Aleksander Arbiter, and he also featured a lot of East European and Serbian amateurs or or porn starlets.

I had a lot of athens-girls and AG-Angels stuff too, but I lost it at a HD crash.