Re: P-90 size Tone Zone?
I'm late to the party but I lacked of time to reply sooner.
I have various P90 sized DiMarzio humbuckers, including a TZ. This one is currently in a home made "experimental" Super Strat, with a basswood body and a Kahler trem. It was previously in another Strat shaped axe.
Sum up of my feelings : to my ears, the P90 sized TZ has an ambiguous tone.
Mids might appear as slightly less muscular and highs as a bit more "refined" than with a regular HB, for the reasons mentioned by Funkfingers.
Now, the bassrange seems a bit fuller/spongier, probably because of the extended magnetic field mentioned by DiMarzio -unless it's due to the two rows of poles protuding below the baseplate, while the regular TZ includes only one row: twice long(er) screw poles = more inductance and bassier tone, IME...
IOW, such pickups have their own tone. They probably couldn't be recognized from regular HB's in a mix but they "feel" differently when played: more polite but also somehow rounder. They need a no load tone pot, IMO.
Last but not least: P90 sized DM's are really not my favourite, being a bit dull compared to most of my other pickups. But they sound really good when splitted and wired in parallel with a regular SC (=especially good emulation of a regular Strat in position 2 or 4).
FWIW.