Both boards have the checkerplate ornamentation. (sorry Tom, rubber mat on non-commercial rbs)
The width on the 28-29 is a bit narrower IIRC. I do know the original 28-29s have the Script Ford centered along the side. Not sure on 30-31.
For a while there Rootlieb was making the boards with Ford Script. Then Ford started making noises about a licensed trademark and for a while Rootlieb didn't cow-tow. But I guess eventually they made up and shook hands and the script came back.
Of course the Script cost more money. Any reason is a good one to raise the price. Well, this I expect due to demand of the marketplace which REALLY wants script.
Joe K