Why change saddles for a tour? If the saddle you have is OK, just go with it. If it's not, you should have changed by now. I try to make my equipment changes after a tour. Then I have lots of time to shake things down.
Everybody's anatomy is different. There is no saddle that is good for everybody. For me, the most important point of the saddle is that you can put your weight on your sitz bones. Nature put them there to support your weight. http://www.nikkiyoga.com/where-are-my-sitz-bones/
The next most important thing is how you sit on the bike. Keep an active stance. Don't rest on your hands, but use your core to hold your body up. Transfer weight to your feet when you can. Move around and sit in different positions.
The last thing is to bring some Neosporin (or similar). I find that no matter how much I prepare for a tour, I tend to develop some chaffing in the first few days. A little cream can provide a lot of comfort.