Dexos 1 is full synthetic optimized for GM gas engines. Dexos 2 is full synthetic optimized for diesels.
Go to your local parts chain store and look at the label of the full synthetics from ACDelco, Mobil 1, Valvoline and even online at Amazonbasics. The label will tell you if it meets Dexos 2 requirements.
Other brands like Castrol and Motorcraft meet Ford's synthetic requirements, which are very similar, though not identical, to Dexos.
In a pinch, any of those full synthetics can be used for the other as long as you stick with correct viscosity, but to maintain the warranty, stick with your specified type.
'18 Rockwood 2109S '17 Silverado 2500HD WT. Hookups? What hookups? Mountains, please.