Because the oem vendor of the brake "systems" being referred to here were supplied by bendix back in the day, all kinds of urban myths take wing regarding parts interchangeability.
Bendix manufactured tens of thousands of different brake systems, and several other vendors also manufactured "bendix" components under a licensing arrangement. Same as for the lockheed-pattern brake systems, same as for kelsey-hayes systems, etc.
And...in the case of some bendix brake systems used in hd semi-floating and full-floating drive axles (and consequently some steering axle brake systems), there is some interchangeability amongst actual drums (and hubs) amongst various oem applications.
And...in the case of the rear (drive) d60 axle apps, drums designed for use with nominal width 3" rear brakes shoes, were used with both 2-1/4" and 2-1/2" brake shoes/backing plate assemblies, and in some cases used in steering axle brake system apps as well.
In this day and age, the "parts house" look-ups are worthless in determining which brake system you might be dealing with, and...interchangeability. That database shit is gleaned from information that was wrong 30 years ago, and is still wrong because the shit is obsolete, there is no "movement" in the inventory, and nobody has an interest in correcting the data, those dbases are supplied by developers outside the actual parts manufacturing system and are several steps removed from the real world when a discrepancy is discovered.
However, for proper identification of component level stuff like this, we must have well-focused, digi-shots of the component/system in question including any number string present, no matter if a "part number", a "mold number" a "die" number, a "lot" number, a "date code"...whatever!!! A lineset ticket is "nice-to-have" stuff, but certainly May not reflect what the vehicle in question has mounted. And what is there now is all that matters. Post the information, we can work hard to assist in identification, anything else is pure bullshit and conjecture.
The best source of information regarding brake systems such as this is your local friction materials supplier/remanufacturer. They will have extensive industry references (not some parts house bullshit database) for any brake system ever manufactured and used in the north American market. Take your parts that you are trying to replace to a friction materials professional and let them help you obtain the correct parts.