Yes you have the sizing notation correct. 22-20 refers to the taper from head to clasp of a leather band. The 2mm difference is observed on all the bands I've seen over the years.
One note of internet security for your future reference, signing your full name is not recommended. I take it you are posting from a military base judging by your sig where this may be necessary at all times but here its a little too much info. Thanks for posting.
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