Garmin 3xxx to 4xxx compatibility question

[gerg]

I've order a 4212 to use as a primary display including radar and weather, and want to add a second display to display radar or whatever I don't want on the primary and to use as a backup.

I can pick up a 3210, and the specs look like it will network in, but has anyone done it? Will I be able to share info between them (g2 vision card info, waypoints, etc).

It will eventually be delegated to the cockpit and I'll add another 4xxx or 5xxx up front. One large bill at a time.

Thanks

[gerg]

Ok, I found the answer under a different post. I just can't figure out how to delete this one. Sheesh...