Two Different Gem 1912 Versions

I have a couple Gem 1912 razors that appear to be identical except for the length of the lather catcher tang at the back (see photos).  One is long, and one is short.  They have identical markings and identical handles.  Neither (for example) is marked as a Gem Junior or anything different.

Anyone have any information about the differing two models?  For example, was Gem producing them simultaneously and positioning them differently in the marketplace?  Was one earlier than the other?