The Autolite gauges have square RPM and MPH big gauges while the Stewart Warner gauge cluster has curved ones (best I can explain it). The CaseIH parts site has good graphics of each for your comparison. While I think Don supplies high quality used parts (I have purchased from him) you will get gauges from a salvage tractor and they may or may not have all the gauges in the cluster working unless they came from a running model where Don could check them before removal of the cluster.
If you just need a functional cluster Don is your man.
I got a restored Autolite cluster from Roger Hornbacker and it looks new. The deal with Roger is you send him your old cluster and he either restores it or sends you one from his restored inventory. Don't know what you are willing to pay but as a wild guess I am betting a used cluster will be about half the price of a restored cluster. My 630 restored cluster about 4-5 years ago was about $300 but it looks and functions like a new one, Roger does excellent work.
Either choice, depending on your needs, I don't think you can go wrong.