Since my outdoor bike is my indoor bike, my saddle is exactly the same

I noticed that when my bike is mounted on my Saris H3 with the included riser block for the front wheel, my seat was titled slightly upwards at the nose, which isn't the case when the bike is off the trainer. I removed the front wheel block which made my saddle level again and I've found I don't get any weird discomfort anymore. In other words, make sure your bike on the trainer is setup similar to your bike off the trainer. I don't see any reason why riding indoors would necessitate a different saddle. Also, remember to stand-up and ride on occasion as it's too easy to stay planted on your butt when riding indoors which decreases comfort over long rides.