suggests that there's some sort of commonality between them

There is a commonality: they use significant whitespace. I understand that this is a syntactic difference and, given that I said I had used each quite a bit, that they're quite different languages. That said, syntax is chosen for a reason and I feel most comfortable in the significant whitespace world. I'm excited by Rust but, shame on me, the syntax had confused me into thinking the language was more C-ish than Haskell-ish. My point in the grandparent was that the article did a nice job of changing my (admittedly shallow) opinion.