Deere 72" 7iron Commercial deck interchange 3320 vs 4720

[Bikewanderer]

I have a 2008 Deere 3320 with a 7iron deck S/N M00072D340386, and my deck gearbox froze up today. Also the deck itself is still serviceable but getting in rough condition. I found someone selling a brand new 2008 7iron deck S/N M00072C340298 that was originally off a Deere 4720. The hanging hardware look very similar with only slight differences and the deck itself looks identical. I'd like some confirmation if anybody can offer it that I'm not way off base in thinking this. I'd be money ahead to get a new deck and have a second one, given the cost of the gearbox and other parts my deck needs. But mine is still serviceable and I'm not looking for a project here. Ideally I'd drive the whole tractor there but I have no trailer.

Any thoughts before I proceed?

Thanks!