Ok....I got the F's mounted, still don't have the G's for the rear. The two wheels in the side by side picture are different size wheels, so don't compare size. The radial is a F-70-15, and the bias tire is a G-70-15.
The tread pattern is a bit different, and the radial is a bit "rounder" but I think they did a good job trying to get the look right, and still perform like a radial. I can't test the performance of the tires until I get the rear tires. I'll report back when I get them/hopefully next week.