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AppleCare was essentially replaced with AppleCare+ (to include incidents of accidental damage similar to that for other iDevices), so cost went up a few dollars, depending on which Mac you have.
AppleCare+ must be purchased within 60 days of your Mac purchase.
https://www.apple.com/support/products/mac.html
i bought student apple care for rMB for $184 and now my 1 month old rMB 2017 is $229 according to the phone call i had.
 
Good thing you registered your AppleCare at the old price, then!
So, you have no interest in the accidental damage coverage that was added (?)
 
Oh... so you will have different coverage on your two rMB.
Keep in mind that you can't add the AppleCare+ more than 60 days after purchase of your 2017 rMB. Other than a higher cost, that's the other important change.
 
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