Suspect you‘re looking at the same unit, but with everything including the tray.
The slide-in-replacement product is the GPS unit and keyboard, nothing more. The tray, VOR / ILS head doesn’t need to be changed. Cost me ~$11,500, bought it from an out of state dealer, no shop involved, no labor.
I ran their checklist capturing info from my GNS 430 before it was removed. Installed the IFD 440, transferred the info I had collected. Ready to fly, start to finish in 45 minutes. My GNS 430 was installed in 2004. I’ll sell it, but it owes my nothing.
I’m really impressed with the new GPS. It‘s talking to my iPad, portable Stratus, and the wireless network in my hangar. Annual Jeppesen NavData updates are only $160 a year.