Dwarf angels can be very aggressive and territorial towards each other. If you have a big enough tank - maybe but erring on the side of caution. There's always a chance that they tear each other to shreds lol. I personally wouldn't risk it
I have a BiColor Angel and a Rusty Angel together in a 150-gallon, and they pay each other no-mind at all. However, they were introduced at the same time, same size. 'Your mileage may vary.' If the tank is not at least a 120, and especially if one is in there ahead of the other-- maybe not such a hot idea.