I have run Cross fires on semi trucks over 2 million miles personally. LOVE THEM. Pressures are exactly the same. I have seen a chart about the tire wear when pressure is only a couple pounds different in a set of duals. They have a check valve in them, so that if one tire has a leak, it will seal, and not allow air to drop over 10# in the other tire.
I got better tire life, and tire wear with them, both on my semi, and on the trailers.
Also made it very easy to check pressure. Just take a glance at the face of them, and if in the yellow, good to go! Turn black if under pressure, red if over.