Actually, we don't know if a genetic difference exists. Remember that all members of a species have genetic differences. You and I may be 99% identical but the polymorphisms between us are important. But for species definition we consider members of our species to be genetically similar but by no means identical. Species definition does not rely solely on genetic homology but more on the ability of two members of the species to interbreed.
However, when we bring technology into the mix I think the traditional definitions are incomplete to say the least!
Don't fall into the trap that was built in the last five decades (the Watson-Crick era) that DNA identity is the end-all be-all of biology. It is an important element but we are learning that much more is involved.
Let me give an example. If you had a video tape entitled "How to build a VCR" but you had no VCR, you'd be sunk. Likewise if you take your complete DNA and use it to replace the DNA in a pig fertilized egg -- You will NOT grow a clone of yourself. (it would be like trying to play a VHS tape on a betamax!

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The native zygote proteins, DNA binding elements, cellular microstructures, epigenetic organization, etc. all have profound effects on the developing embryo.
Therefore, it is my position that genetics of the Hu-lons may be within the normal genetic variance of humans. It it non-genetic differences that may be important and may or may not be testable.