I guess when I use a term like OCD, I can understand where you're coming from, but in all actuality, I'm just after a complete set of DBEs. Whether they're a mismatch of brands, or offsets, it doesn't matter to me.
But it does matter. It matters very much, as I mentioned upthread. You're under the misconception that there is a standard set of wrenches with box ends in a standard set of sizes. Again, that simply
is not the case. As I said, a "complete" set of DBE wrenches very much depends on type/pattern (dwarf angled, dwarf offset, long angled, long offset, etc), vintage, and manufacturer.
Here is a crude example.
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On the left is an excerpt from a 1948 Bonney catalog, on the right is an excerpt from a 1948 Plomb catalog. Both excerpts are only showing each Mfgr's offerings of long DBE wrenches with 15* angle ends and 12-point openings. One might think they would make long DBE wrenches with deep offset handles and 12-point openings in the same sizes, but that's not the case. And it's certainly not the case for other patterns (dwarf 15* angle, dwarf offset, etc).
Anyway, the wrenches circled in red in the Bonney column are unique to Bonney - they were NOT MADE by Plomb. The wrenches circled in red in the Plomb column were unique to Plomb - they were NOT MADE by Bonney.
And that's only two manufacturers, same type DBE wrench, in 1948.
If you really wanted to be exhaustive, you could continue this method, adding other Mfgrs (e.g., Williams, Blue-Point, etc) and identifying unique wrenches, until you have a 1-N list of every size combination that any manufacturer made, in 1948.
On the other hand, the wrenches NOT CIRCLED were made by both Bonney and Plomb. For your purposes, you could start to consider those common - to Bonney and Plomb, anyway.
If you jump to 1968, you'll find the situation to be a lot different.
I wasn't trying to be difficult, and it has nothing to with a person's degree of OCD or not. It's just a fact. There is no single simple answer to the question of a "complete" DBE set. Mfgr, era, and type all matter.