Most people, especially newer riders and people who aren't straight hardcore gear heads, are going to purchase their oils from walmart or somewhere similar. And to the best of my knowledge, the 2-4 brands of diesel oil that are sold at box stores are going to work just fine for an oil change in a motorcycle.
Down on the chemical level, there are some differences between the two, sure. Like, diesel has the ability to clean and suspend harsher deposits than cheaper car oil. And this harsher cleaning environment can lead to the disintegration of chemically different gaskets and metals over time I suppose. But like everything else, for a simple clean out oil change and just to have something in the crankcase that will "do the job", you'd be hard pressed to find a diesel oil that would get anyone on the website to say "NO ABSOLUTELY NOT!!"
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