CX-9 Spare Tire Questions

So since I run 235/60/18 tires in summer and 235/65/17 in winter I need a new dummy tire to replace the worn out one.

Would the spare tire from a Ford/Mazda 2014/15 CX-9 be the same diameter or would a spare from a Mazda only 2017/18 CX-9 be comparable?
 
I’m confused - did you lose a tire, and you’re looking for a long-term spare option? Both your summer and winter tires are smaller than a 2007-2015 CX-9’s tires, and the 2016-2023 CX-9’s tires are bigger still.
 
Long term spare. I remember reading somewhere on here that the spare tire from one of the CX9s was the same diameter as a 235/65/17, 235/60/18 tire.
 
The spare may indeed be the same size as a 235/65R17, but that doesn’t mean you want to run one wheel with that much of a size mismatch long-term.

Are you outside North America? I’m just wondering if your OE tires are actually smaller than what we got in those years.
 
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