Almost no one would use the term "new Pendolino" - in fact I don't think even Alstom called it that. The origins of the term are a bit unclear, but I suspect it was an overzealous Wikipedia editor who misinterpreted a headline describing "new Pendolino" orders. Even Astoro is a bit of a stretch - it's certainly what the SBB call it in their official communications, but it's only sometimes used by normal people or the media. And do take into account that in the past the Zurich-Milan services were operated both by SBB units (which can be called Astoro) and effectively identical FS units (which are certainly not called Astoro). For better or worse, most people call it the ETR 610. (RABe 503 is only really used by enthusiasts and the occasional railway journal, and again doesn't cover the FS units.)