The VQ35DE to the VQ35HR engine changed nearly 80% of the parts.
VQ35HR and 37VHR are effectively the same engine in terms of bottom end. Stroke increased for the extra displacement, bore stays the same. The differences dual-intakes, and VVEL were added for better intake & head flow and maybe a few other things also.
The HR series of the VQ architecture went from 07-2022 in the G/Z cars. It wasn’t a redesign of the engine but more of a final touch
Check for evidence of modifications, then probably save up for a few of the bigger maintenance jobs down the line.
Say near 100k miles I would be preparing for: water-pump, ignition parts replacement interval, oil leaks, DI carbon build up cleaning/walnut blasting, and possibly cooling system maintenance
You might run into other unexpected issues along the way, but the aforementioned would be bigger maintenance jobs I’d expect on the car after some miles
Other than that, do fluids maintenances diligently and enjoy a damn good engine especially backed behind the 6MT
I like the idea of replacing my G37s with something like a 340i