DNA library?

Ever notice that a piece of corn is structurally very similar to a human molar?

I used to travel a lot and it seemed not unusual to see someone of one race on the other side of the world who looked just like someone I knew of another race at home. They could be identical twins, except one was white and one Asian, or whatever. Made me wonder if God reuses DNA patterns except for changing up one really significant factor. I’m thinking that if I had the chance to make such creative decisions, I might do something like that just for the fun of it.