Alt, not Ctrl, handles a couple of chrome actions. Alt+1 through Alt+9 switches accounts (Ctrl+1 through Ctrl+9 is reserved for switching tabs instead), and Alt+/ copies the page link.
A few bindings drop or add a modifier compared to Mac. Instant Send is Shift+Z here (no Ctrl), where Mac uses Cmd+Shift+Z. Pop Out Reply is Ctrl+Shift+R here, where Mac uses just Shift+R. Pop Draft In or Out is Shift+P here, where Mac uses Cmd+Shift+P.
Inserting an emoji shortcode needs Ctrl held down. Typing :smile on its own works on Mac; on Windows you hold Ctrl while typing it.