'One in the same' or 'One and the same'?

Transcript

Sometimes a word that sounds like the right word and feels like the right word isn't actually the right word, it's an eggcorn. The acrobat and the farmer who are the same person aren't "one in the same," they're "one and the same." You don't have to choose between being an acrobat and a farmer. You can be one and the same.