I understand intellectually that Ben looks like Jaren, but they just don’t look alike to me at all.
Jaren looks like a grown man. He has some facial hair and more adult expressions. Ben looks like a fetus. He has a blobby kid face.
They literally have different voices (see: Jaren has a special Ben Voice that he only uses as Ben).
Jaren’s a ball of energetic light and joy. Ben’s an arrogant bastard (affectionate) depressed thot (also affectionate).
My synesthesia has pegged them as basically polar opposite colours: cornflower blue and bright red.
It truly is a wonder and a testament to Jaren’s talent that he’s managed to build a character that exists so distinctly from who he, the actor, is.