You
raise an interesting empirical question. Frankly, I don't think we
know the answer.
Anthropologists have studied scores of small cultures and described
their moral ideas, but I don't know that anyone has done the
comparisons necessary to determine whether the differences are
fundamental in the way that you are talking about.
For example, if all the facts were agree to, would people in
different cultures still disagree? I
think some would; but, as I said, I don't think the work has been done
to prove it.