Nick
The HRPWM modules on Piccolo can phase match (the PWM outputs) to one another for the output stages. Take a look here - http://www.ti.com/lit/ug/spruge8e/spruge8e.pdf
To your point, the tolerance on the incutors will be the major factor.
This might…
Other Parts Discussed in Thread: SPRC678 , PTD08A010W , UCD7230 , PTN04050C , TPS54160 , UCD9240 --or the spec for the module
The PTH08D110 is a part on the 'EightChBuck-DCDC-SCH.pdf' from sprc678 (In the BOM for the TMDSDCDC8KIT, it's listed as 'TI to provide…