In "From Dusk Till Dawn", three different characters were played by Cheech Marin.
There was no attempt to make the characters look significantly different.
Each time I first saw one of the characters, my first thought was "that looks like Cheech", but wasn't sure that it actually was. I wasn't even sure that it was the same actor as before.
Was this an inside joke? Are we supposed to think "all Mexicans look alike"? Or what?