If I use Migration Assistant to transfer files a second time from my iMac to my Macbook Pro, will I end up with doubles of files on my Macbook?

I used Migration Assistant from my Time Machine for my iMac to my Macbook Pro (I'm pretty sure) when setting up my new laptop to transfer files I wanted from my desktop; now I have new files on my iMac that I'd like to transfer, and I'm wondering if Migration Assistant will send files that I already transferred to my Macbook again, thus creating doubles of files on my Macbook

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Migration Assistant creates a new account to transfer files from another Mac, so you will end with doubles of files on the MacBook.
To avoid this, you can go with the easier way: get an external drive, copy all the files you have on your iMac to the external drive, connect it to the MacBook and copy the files on the external drive to the folder you want to.
Another way is to transfer them through your network. If you have OS X Lion or Mountain Lion on both Macs and they are connected to the same network, use AirDrop to transfer your files. Simply open a Finder window on the iMac and choose AirDrop in the sidebar. Then, drag the files you want to transfer to your MacBook Pro's icon.
Finally, if you have FireWire in both Macs, you can use Target Disk mode on your iMac (hold the T key while your iMac is starting), so your MacBook Pro will detect your iMac's hard drive as an external drive and you will be able to transfer whatever you need

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