Curious about a J. Wiss and Sons set

[Jonah]

I got this pair of J Wiss razors last night and I was hoping someone could offer some insight. I found this page of the J Wiss catalog J. Wiss And Sons Co - 1907 Catalog: Page 55 and it gives a little info about the two razor set. The numbers stamped on the tangs of the razors are 44 and 45, respectively. The razor marked 44 is a 4/8 while the one marked 45 is a 5/8



Was it pretty common to have two different razors in a set? In my limited knowledge, I assumed that cased pairs were usually the same model/identical.

Thanks for any insight.

Cheers