I can't recall any others (edit: aside from obvious things like laws relating to trade agreements or defense cooperation), but this one makes some sense to keep

I can't recall any others (edit: aside from obvious things like laws relating to trade agreements or defense cooperation), but this one makes some sense to keep the time zones consistent. Also since I made that last comment I learned that Ontario has a similar plan w.r.t. NY. So it definitely appears Canada will switch when the US does.