I don't know that I agree that road and touring bike saddles are "obviously" different. I run the same saddle on both my road and touring bikes, but then, my road bike is mostly set up for endurance rides, rather than racing, to begin with. Depending on how you sit on each bike, i.e., how upright you are, you may find that you need a different saddle, but I'd say that if a saddle works well for you on one bike, it's a decent place to start on another bike.