Yes.
Once upon a time, the categories were:
767 - 757, 767 domestic-only
7ER - 767 international
764 - 767-400 domestic only
765 - 767-400 international only
Pay rates were:
757
767
767-400
Eventually, the 767 and 7ER were morphed into a single category with separate pay rates between the 767 and 757.
The 764 and 765 categories were blended as well but still a separate category from the 767/757
So when we had the merger, since the 767/757 were a single pay rate and single category, unlike our (from a DL perspective) "stepbrothers" flew the 757 as an international narrowbody, there was push to consider the 767/757 as a narrowbody category for seniority list integration purposes. So even if the arbitrator agreed that the 767 category as a widebody, the North negotiations commitee wanted to consider the 747 as a 'super premium' widebody category.
Of course, there are other perspectives on it and I've heavily simplified the SLI considerations and those, ONLY THOSE IN THE ACTUAL KNOW, are free to add some clarity and specificity to it.