Its Ball or Radius, NOT bulge, but we know what you meant.
I would NOT trust an over the counter clerk any more than I can throw their entire store, although there have been a few that are very knowledgeable and I would consider their advice, I've had a dozen more that insist absolutely wrong things are right.
I'm no wheel expert, don't know the answer for sure, but personally, I would NOT do it.
You don't have to be an engineer to be able to tell those two different shaped face will NOT seat like they are designed and instead of spreading the load over the area of the entire face, like designed, instead, it will concentrate the load on the single tiny contact area that will result from using the two differently shaped seat surfaces.
I'm sure you'll find all sorts of morons that have done it and never ran into a problem, because the engineers designed an extra margin of safety into the wheel and fasteners, thus they saved the morons from their own ignorance, but I also have 4 associates that died when a wheel came off their vehicle in a turn.
You find something official from the manufacturer stating its OK, or reputable engineering organization, I'd consider it, until then I would NOT trust a parts counter clerk saying "these will work fine, can I ring you up"?
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