What you can do is print targets from each and compare the deltaE’s and see WHERE the differences lie if you try using the Data Analysis part of i1Profiler (or better, ColorThink Pro). Knowing how large the dE is and as importantly where in color space might lead you to the cause.
Great idea. I think my thought process had been focusing on the printer driver/printer setup (i.e., an overall configuration problem) rather than inside the profile, which might point my elsewhere. I should have time over the weekend to stare at this, will let you know what I come up with. Appreciate it.