Just got new license plates with different numbers (MN) is this correct?

I'm in Minnesota and I ordered new tabs for my license plates. I bought the car about 3-4 years ago and so don't know if the license plates had been renewed a few years before (since they're changed every 7 years).

I had the license plate number from the car dealership that was on it and for the last few years simply got new stickers. But these year I got a completely new license plate pair in the mail. The letter mentions the new plate number and my new registration card, but then lists the previous plate number, too.

I suppose I've just never gotten plates with a completely different number and I just kind of want to double check that this is normal or not. If they sent me the registration card showing the change of plate numbers I should be ok, right?

And what do I do with the old plates? ..I don't even know how to change them, lmao...