Comment by ABCLAW

No, most genetic drift that ends up being reflected in wildtype populations happens during those periods, because small errors taking up a sizable percentile of the allelic distribution is easier when there are less alleles.

When it comes to neutral mutations, we can literally see constant variance creation in plenty of non-coding areas of DNA over time.

Drift occurs at a fairly consistent rate that reflects the intrinsic error rate of the particular replication machinery that a given organism uses. You can measure the statistical error rate of different ribosomal complexes.

Different planets are going to have different selection pressures. They'll have different conflicts. Different crises. Different cultures. Different reproductive preferences. Imagining that these populations will converge on the same wildtype by sheer chance is lunacy.