wiring help

That should be fine. Just make sure to have the transformers in phase.

No I don't think you  can...  Neither post on the KW C&D 14 volt is  common to the  U connection ,You would have to use one of the handles A or B  and the U connection  and scroll up the voltage to 14 volts.

OR, if you are dead set on using the 14 volt C-D on the KW, you can pick one, C or D, and phase it to the Z4000 common, and have 14 volts referenced to the Z4000 on the other.

It's much easier to use A-U or B-U, though, and have the flexibility of being able to fine tune your accessory bus.

Basically, the 14 volt fixed terminal on the z-4000 will be connected to one accessory buss and hopefully, the 14 volt fixed terminal on the KW transformer will  be connected to the other accessory buss. I am new to phasing but assume you connect a wire from z-4000 'U' to 'U' on the KW? Confusing to me- Thanks for your help-Rolf