shortly skimmed through this thread.. found this that i'd like to address.
The full .320 SBF is useable on this 340 ota. It's kind of like when we had 2.3.9/2.1u1 and 2.3.15.
Just a heads up though, the kernel is very likely not different, to those "skeptics" out there. It is probably compiled on a different date, by a different employee, hence the different version.
Also, the AVERAGE user has NO need for a full SBF other than "peace of mind", or like this case, to get back on the update path. Any normal root user would not edit anything on the level to actually need to replace anything other than /system, so system sbf's work PERFECTLY fine. You will not find a dev putting anything out that edits things directly to require a full sbf. It's just not possible for us with the locked bootloader.