If you change sidewall height to tire circumference, you'll be correct. Sidewall height can be quite different yet still end up with a given circumference.

 

OP, like I said earlier, the only way to do a true 4 tire rotaion on you lightly staggered setup is to dismount/remount the tires since the wider wheels need to stay in back. If you go w/ a higher treadwear all season tire you should still get decent life going side to side as long as your alignment checks out.