Any difference between pre-installed apps and previous versions?

I just bought a MacBook Air. I immediately transfered everything from my Time Capsule backup of my 2008 MacBook. The software on the MacBook was completely up to date via the App Store or Software Update. It didn't occur to me to consider that the new Air came with software pre-installed until just now.
Now I'm wondering if I overwrote anything important or if the Time Capsule/Time Machine restore takes into account anything that was pre-installed or if all the software was the same already and it doesn't matter. Normally, I could just use the included restore disks that come with the computer to answer this question myself but with the new Airs, there are no disks.
So I don't really understand how something like a new MacBook Air works. If I wiped the disk and used Lion Recovery would I get everything back that was on the original installation? This seems logical but I don't know if it is true. Anyone know the details about how this works?
Thanks.

Just to double check.  Go into the Purchased tab of the App store.  You should see the apps are "installed".  If they have a button that says "install", I'd do that.
Setup assistant knows not to copy over newer software,

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    But: mostly it is not really necessary to have real time data and if - for example to check the stock in the warehouse - this is just a single part of the app that can take a few seconds to check with a usual sync - but the rest of the information is stored on the device and used form there without the need for connectivity.
    Hope this gives you a better understanding.
    Regards,
    Oliver

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