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Not sure about size, but I would believe they require the same size wheels.
As far as load capacity, they will be the exact same, only the R4's will have a little better traction in dirt, but the R3's are softer on the turf - all depends on what you need.
As far as load capacity, they will be the exact same, only the R4's will have a little better traction in dirt, but the R3's are softer on the turf - all depends on what you need.
