What will happen if skip upgrading iPhone 3G & then restore to iPhone 4?

Character limit in the subject line made it hard to get my point across, so I'll expound...
I've got an iPhone 3G running iOS 3.1.3, and also have my reservation in to get the iPhone 4 on Thursday. In light of lots of people talking about performance troubles with iOS 4.0 on the iPhone 3G, I'm thinking I might skip the upgrade.
Normally, when I've gotten new iPhones, I do a full backup right before I go to the Apple Store, and then when I get home I plug the new phone in and let it restore all of my data. But, what will happen when I plug in my iPhone 4 if my 3G backup has everything coming from a 3.1.3 image? Is it going to end up "downgrading" my iPhone 4 to iOS 3.1.3, forcing me to then run an OS upgrade? Is the restore going to outright fail?
Wondering if I don't just need to bite the bullet and upgrade my iPhone 3G to make Thursday that much easier...

It will work, It will use the apps and data from the old backup, but will not change the operating system version.

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What will happen if skip upgrading iPhone 3G & then restore to iPhone 4?

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