I'm assuming we're talking about that corrugated looking section in the first picture: I have a little bead roller with a multitude of dies that I've used to match similar sections very well. It wasn't expensive, probably got it from Amazon, or maybe Eastwood I can't recall. I marked some indicator marks on the depth adjustment to keep things as consistent as possible; count the turns.
If it's a long run, you need a fence and the steel distorts (badly); but within say an 8-10" length, making that patch its completely achievable with some patience and practice (and the right dies).
If you can buy the repair part - and the "waves" match(!) - well that's the quickest answer.
