I have 35x12.5r20 Toyo Open Country muds and need to replace the front passenger one. I have a used exact same tire from a previous set that has slightly more tread than the front driver tire. They are fairly similar in depth, but one still has slightly more depth. Can I use this spare one to replace the passenger side or do I absolutely NEED to replace both in the front? Or should I replace and move the slightly different depth pair to the back? Ram 2500

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