I'll have to check my CDI ends, but they look different than yours.. doesn't have heat shrink wrapping around to the threads.
I ran a second test of PR2 with DPA omnis a free outdoor amphitheater show last Saturday. Had my open rig rolling as well, so was able to play around with the PR-2 in the head-worn rig, swapping between DPA 4061 and 4060-CORE, and swapping between the Deity batteries and Energizer Lithiums (a fresh, unused pair this time), as well as moving between my open recording position, center of pit, and directly in front of a PA stack in search of highest SPL. PR2 input gain remained set to 0dB the entire time.
The 4061's worked fine, with an output level which seems appropriately matched to the input stage of the PR2.
Switching to 4060_CORE produced some audible bass distortion again, particularly when standing directly in front of the PA/subwoofer-stack in a typical close stack-taping position. Using new batteries, the distortion at this show was significantly less bad, yet nether set of fresh lithium batteries completely eliminated the overload problem as hoped. Perceptually this concert was significantly louder than the previous test I did several weeks back at the larger amphitheater event with what turned out to be dying Energizer lithium AAs, certainly so when standing adjacent to the stack. How loud was it? Not sure. I used a sound meter app which hovered around 91dB while standing at the stack, but it registered approximately 90dB back at my open recording spot a few rows behind the pit and that doesn't add up. Doesn't add up as obviously it was significantly louder directly in front of the PA. SPL measurement was taken using a new to me Galaxy S24.. and I don't trust the SPL app.. I see no way of determining what filtering it is using, and it seems it might have been be hitting some kind of hard limit possibly imposed by the phone. Dunno.
Have yet to measure the mic power voltage out of this particular PR2.
Prior I did do a quick test comparing both sets of mics plugged directly into PR2 (at 0db input gain) verses recording via DAD6001 phantom adapters into R-44_OCM. I used the closest equivalent input gain setting available on the R44, which was -2dB. There was significantly increased headroom using the DAD6001 adapters powered with P48, but I've not yet quantified how much.
I now feel I've at least done enough testing to confirm use of 4061 > PR2 will be the best option for use by my newbie recording friend while I'm away. I'll report on how well that worked out, and continue with further testing after I return mid October.