I find it odd that after having heard catalan I find it more closer to how we sound then actual Castilian, regarding Slavic I didn't even knew... got to check it out!
It's fascinating to me how languages develop alongside one another in close proximity yet can sound so different despite looking pretty much identical in written form.
My wife's family make fun of the way Spaniards speak Castillian with an effeminate lisp (Thilly Thauthages vs Silly Sausages) and claim that Rio Platense Spanish is "correct Spanish" despite it being mostly Italian. Similar to how some USAians say the same about their corrupted form of English.
Crazy colonists! Lol