Clamping expansion question

I got a clamp a while ago and thought I’d try it out. I am just getting ready for when I want to add it to my routine, not sure when that will be. I noticed when clamped I get the following girth changes

Mid shaft 14.2cm with no clmap and 14.7cm with clamp
Glans 14.0cm with no clamp and 16.1cm with clamp

Is this usually the way it is with clamping ie a big change in glans girth and a smaller increase in mid shaft girth?