What differences should I expect booking via BA Holidays (flight + hotel) vs BA.com (flight only) - other than the hotel of course!

I’m primarily thinking of when a flight is cancelled - can you still rebook -3/+14 days into any selling class in same cabin? What happens to the hotel if they need to move?

Does ORC still apply during travel for double tier points - e.g. if rebooked onto other carrier prime code instead of BA codeshare?

I don’t want to come unstuck if there’s schedule changes on a TP run through BA holidays