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You should just be able to swap the memory and SSD.
This message was posted on behalf of Intel Corporation
In this case, you have the same NUC model, so you will not have any problems if you just go ahead and install the hard drive with the operating system, but as best practice it will be better to reinstall the operating system.
I would add that this *is* recognized as a hardware change and the O/S image will thus likely need to be reactivated. This usually happens automatically, but you can force it to happen immediately if you wish...