This is very basic and maybe you have to have tasted the difference to know it.
https://www.loschilangos.com/post/what-s-the-difference-between-tex-mex-and-authentic-mexican-food
Many years ago in San Francisco I read about a place in the (now famous) Mission District that had birria, a Mexican goat stew. We went there and the oh-so-sweet Mexican woman told it was beef. I would say "cabrito?" and she would say, "No, beef." After we cleaned our bowls, all but licking them clean I said "cabrito?" and she said, "si, cabrito." And I don't think I've ever seen it in the US with goat. But I haven't spent much time in southern border towns.