Yes and no.
As long as the boards are factory, then a given line (or run of a pcb board) should contain the same components (say 75c to 75c, or 250 to 250). Since parts are usually batch ordered for production runs. However, in preparation for the next run, components can always be sourced from a new vendor.
However, given the voltage and current requirements are going to be substantially different between a 75c or 250c, a different regulator would be expected, as well as required. So you really can’t compare the two (as it’s apples to oranges).
It should be within close proximity to compare a 250c parallel vs 250c series though. Though even then, the circuit topology (in the regulator section) is quite conceivably different, as once again, you’ve got a bit of a different application specific intent in mind. And I would imagine that’s why they make the two variants.
But again, this is theoretically speaking, from an electronics application standpoint. As I’m not privy to, nor familiar enough with their designs, as well as not having access to any kind of schematics (of course).
Actually, the more I think about it, the only real solution would be to drop the question in a private email to Evolv! (Again, my subjective analysis is at best supposition, and familiarity with knowing how to “do the same thing” in different ways electronically speaking, each with different trade offs.)
I prefer the Smoant Cylon. Which is a series setup (using dual 18650’s).
I originally used 25r5’s for the first year (as well as in a DNA VT133). BUT when I switched to the 30Q’s, my battery life was extended (noticeably so). Primarily because I typically use a regulated mod between 30-45w.
So IMO, the battery chemistry, and design (targeted application) has as big a role in things as the regulator.