just comparing the images (payload_dumper), partition contents, shasums
Some users being on /e/ had voice calling difficulties, while the OS version seemingly was the same, but modem/dsp…-partitions can differ depending on when they last flashed stock rom. So the resoution was to include the other device partitions into the /e/ ROM too.
dk1978 does this for LineageOS 0.17/0.18 since spring 2020, as he wrote in the main threads for those versions in this forum, /e/ just was late to include it and realize the problems if you don’t distribute them. The partnership with fairphone should have it covered, but my impression is qualcomm is friendly to the firmware blobs being public as wifi chipset blobs are on github for a long time by qualcomm devs. This is how linux distributions get their fix for the Atheros line.
Edit: this is a source without looking at images 🐛 FP3/Q no in call audio after update to 0.18-q (#3670) · Issues · e / Backlog · GitLab
And for those who asked, we are bundling the firmware via OTA.