i have kept both of these fishes at one time and.or another... never mixed them though. IME with them, i don't see why not??... definitely would say it's worth giving a shot!
Both fish are fairly similar to one another, body structure, movement (open waters), feeding habits, and behaviorwise. Only thing i would say say is the dorado's temperment is abit MORE aggressive than the odoe??... as long as there's enough tank space for thes 2 to move around in, it should be okay!!
GL!