Stupid Axle Questions.....

Alright, so I have an idea brewing. A question. Lets just "for example" use the Chrysler 7.25 rear axle as the example. The axles are 27 spline. Lets also for comparison's sake compare it to the Dana 30 that also has a 27 axle spline count. Since they both share the same spline count, are they the same diameter? I found the Dana 30 info, which is 1.13" in diameter, but no diameter info on the 7.25.
IDK the answer but physically the spline count has nothing to do with diameter Rusty. The spline SIZE is the dominating factor.