Breeding two species to become genetically more similar?

I was thinking of a scenario in which people decide to use breeding to try to make two species more genetically related to each other. The people take genetic samples of each individual from their breeding populations and compare its DNA to the DNA of the other species. The individuals that are most genetically similar to the other species are the ones that are allowed to reproduce. The people do not transfer genetic information between the two species as they consider that cheating.

Would this kind of breeding technique be possible and could it make two species more genetically similar? Would it be possible to breed two different species to become genetically similar enough to interbreed with this technique?

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Breeding two species to become genetically more similar?

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