Yes, the machines use the same firmware (Grbl) and the same control software (Carbide Motion — though there are a number of other options to choose from).
Major usage/workflow difference is the Nomad being more convenient w/ a built-in spindle, directly controlled by the machine for on/off and RPM, and having a tool length sensor. Also it bundling MeshCAM (extra purchase for the SO3).
Brandon, I have a Nomad 883 Pro you’re welcome to look at. At the present I’m putting together a Shapeoko 3 XL that I recently purchased but we might be able to dig up something to run on the Nomad for you to watch. Live south of Seattle in Edgewood.