My mind boggles. It could be my natural state or the meds I am on.
Here is how I see it.
Eaton, and all the others that make breakers of that style do not make anymore different trip curves than they have to.
Furthermore I submit that they simply take two single pole units, add a common trip rod and rivet them together to make a two pole or three pole breaker.
To me it is inconceivable that they would use different trip curves in the same multi-pole breaker. It makes no sense to, it would likely be outside the listing, and if there was a reason for such a breaker it would be advertised as something special and with a price to match.