There are so many different TB+ humbuckers that I honestly couldn't say that TB+ rule in general.
Fair point, that! It seems to be a name applied to a bunch of different pickups. I only have experience with the black plastic LPB1 circa '92, so I can only truly vouch for those.
I had assumed that Thunderbird black plastic pups are the same as mine, but it's been 15 years since mine was made ... and haven't we already had threads about how at some point there were split-coil pickups under the plastic? I don't honestly know what's inside mine. Is there any way to tell whether it's split-coil or humbucker without ruining damaging the pickup?
Either of the black plastic designs (and were there *only* two?) could physically fit inside a giant mudbucker cover (but what are the "polepiece" screws - cosmetic only?) ... but that SG bass minibucker obviously can't be the same design.
And I have always assumed that the ones in chrome covers must be somewhat different as well - different bobbins at least, to fit in the narrow width.
... plus whatever the metal cover does to the sound