Hi - would agree that the pattern lacks some of the cuts of Glengarry. If you look at the catalogue site Replacements Ltd. (States based) you'll see that Stuart did a lot of this sort of alternating fan splits (the upright cuts) and rather basic criss-cross (noughts and crosses/tick tack toe) grid patterns - probably so did others - although we do know this is Stuart.
Don't know if you have already tried this source, if so there are others, and it can sometimes take a while to track down patterns, so patience is essential.
Of course, someone here may have the answer for you.

Welcome to the GMB by the way.