Yes, because before the repair I was also using several other combinations, including Android 13 base (with both Android 11 v9a and Android 12 v2a binaries) and power consumption on 4G was equally high on all of them (and never dropping below 200-500 mA, even when the device was completely idle). At the moment, after the repair, I currently have Android 13 + Android 11 v9a blobs, which is a combination that I did use quite long (more than a month, directly before switching to Android 12 base + Android 12 v2a binaries) before the mobo replacement, and the power consumption on 4G (and 5G) is now completely different (much lower) than then, on par with power drain on 2G, i.e. 100-130 mA screen on, dropping to 30-60 mA when idle.
I haven’t changed anything when it comes to how I use the phone, what applications I have installed on it, where I use it, same SIM card, etc. I even tested it with the very same OS restored from dd image (rootfs and home imaged 1 day before sending the phone for repair). So actually the ONLY thing that differs is the new mainboard. Yet 4G power consumption is completely different, i.e. muuuuch lower.
Whole day on 4G / 5G today, still 66%. Before the repair it’d have been in the 25-30% range at this time of day on 4G.
P.S. I have now reinstalled SFOS from scratch, considering that it’d be a good opportunity to start anew and get rid of all the garbage that was collected during 2,5 years. But due to not having access to the AppSupport in the Jolla store (because I have a new IMEI and the licence doesn’t see it) I may consider going back to the imaged old system, which contains AppSupport running very well and not caring whether the licence sees it or not.