Restore iPhone 4S iOS 6.1.2 Redsn0w?

I'm trying to restore my iPhone 4S on redsn0w without updating to iOS 6.1.3. I want to know if there's any difference between the iPhone 4S 6.1.2 baseband/modem firmware is diffrent from the one on iOS 6.1.3. I'm using a Gevey Ultra S on my iPhone now. I don't want to lose that functionality of having my iPhone unlocked.

It will lock the iphone and you can't use the gevey on 6.1.3

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