The army of clones?!

[Ashen Key]

*sneeeeeeeeeeeeeeeeeeeerk*

I would say that, in-universe, it's probably just because the Omaticaya are a clan, and thus they are all family/related, so there is a narrow gene-pool there (particularly if the population bottle-necked sometime in the past.

But aside from that, heee, yes, I had noticed a lot of them look very much alike, with just little difference to make them as different people.