a better analogy would be, 'is it wrong for a chimp and a human to produce offspring?' Something like less than 3% difference in our DNA, so is it ethical for humans to breed with Chimps?
Just an addendum:
We also share 47% of our DNA with Daffodils. No worries though. I personally have never met a daffdil that I like that much. I mean they're cute enough and all...