There is another thread just above (now below), that tells you how to find what server you're on. In that, it tells which market (either old or new), applies to that particular server. So surely, players in the same league (and therefore, same server), would all be on either old or new market. It shouldn't be different.

And just to say, for the first two weeks of this current season, I couldn't find any decent quality players under the age of 26 in my market. But just today, I've found 3 x 18 yo players, 2 at 4* and 1 at 5, and my market hasn't changed.