I just purchased a brand-new distributor for my 1988 Mazda truck from RockAuto; it wouldn't spark, and I returned it. Not claiming that RockAuto had any fault in this, they're just the reseller.
After a month running a used ignition control module in my old distributor, I bought another brand-new distributor for it through Amazon, different brand name, but was the same manufacturer, could tell once I saw it. However, this one worked fine, and powers my Mazda truck now. So I'm just saying that different "brand names" for a distributor for an older vehicle could all be made by the same supplier.