Being a bit vague here it was a series I saw in the 1990-2005 on the sci-fi channel in Europe. The main plot is that there a two geneticists and they find some people have x% difference in their makeup making them not Homo sapiens.
I have some thoughts that it was called 47% or similar but cannot find it. I remember there was a young woman with red hair and a guy they were working for a lab but when they found this difference they ended up working on it "off the books" while the "evolved humans" were trying to find them.
It was shown on TV in Sweden about the same time as the First Wave series. It was a North American series (I would be inclined to think from Canada) Sorry though that's about all the things I can remember which is why it's so hard to find. Even tried looking at the lists of series from the Sci-Fi channel.