I haven't seen a genetic comparison yet, but on the Gallifrey I came from--an alternate universe from the one I was loomed into--my DNA was found to have slight variations unlike the local Gallifreyans. It's probably caused by generations of exposure to temporal technology. Everyone on my Gallifrey is imbued with temporal radiation, even if they never fly in a TARDIS. The transduction barriers that surround and protect the planet put out strong chronon emissions.

The Gallifrey I was living on, and the Gallifrey here, they don't have temporal technology. No time tech, no chronon emissions, no temporal genetic mutations.