I don't think there was a changelog published, but the main difference is the "Channel" -> while the C232 Versions are for "general channel" i.e. the international version of the ROM, this ROM is C167 "German Channel" - probably some settings are included for german SIMcards / WiFi Channels? (Please correct me if I'm wrong)
Before I flashed this ROM I was on HUAWEI_S7-301u_FIRMWARE_android4.0_C232B002_General_Channel_ 05010YBX-root - the main difference I noticed during the last 3 days of usage was better batterylife. While on the old ROM (C232) I had a batterydrain of 1% per hour in standby, this ROM (C167) is really good in that regard. Around 1% batterydrain during 10 hours of Standby is more than acceptable, imho.