Exactly. What if the conditions change on the same night between the time the coin toss is done and the kick. We flip it at 6:15 here in MS. We don’t allow them to change their mind if the wind changes between 6:15 and 7:00. Done is done. Same thing here I think.
If your procedure is to do the coin toss 45 minutes early, then of course, you don't let them re-do it. That's part of a regular game.
But if we cancelled the game before the coin toss, and when you resume the game 2 days later, they're on a new field (original field is used for some other event, became waterlogged or unplayable), and with a scoreboard on the opposite side of the field, I'd let them re-choose.
If it's substantially the same, I'd go with the original coin toss.
That's just me. I don't know if there is any rule support either way, as the game has not technically started because the game starts with a kickoff. So it's not a suspended game really.