235 -70-16 is just a size. It is not a valid description of a tire. The r in your other description could be R for radial or D for Bias/belted tires.
So the 235/70R16XL Is that size radial tire rated for Extra Load, Extra Load is the XL at the end. You need to be careful though, there is a rated weight printed on the side wall that is the max your tire can Carey safely
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