Some tires have more tread depth thus a different circumference. Tread depth will vary by type, brand, and model.
https://www.tirereview.com/science-behind-tread-depth-passenger-tires/
Not sure, I've never a seen a poor quality def warning. The distance part of the warning you're getting makes me think your truck wants a forced regen and fresh def, the codes indicate the tank/heater is bad. What year is your truck? If it is under warranty just bring it to a dealer. If not I would try a def fluid swap before replacing the tank.
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