I do not think so, because the 10.8.3 kext is about 250kb bigger then the one form the 10.8.4 combo update, I think some things still stay from the 10.8.0 version even in the combo update.
You know, you're right! I've just compared
AppleHDA.kext from the combo update with the same kext from
InstallESD.dmg 10.8.4 The tricky part was to assemble the kext, because it seems the kexts inside
InstallESD.dmg are separated in two packages:
Packages/BaseSystemBinaries.pkg, which contains only the kexts binaries.
Packages/BaseSystemResources.pkg, which contains the rest of the data (
Info.plist, the
Resources folder, the
_CodeSignature folder etc.).
I compared the result with the kext from the combo update and it seems there are missing files from the combo update:
Contents/_CodeSignature/CodeRequirements - this file is missing from the main
_CodeSignature folder and from all folders with the same name inside the kexts in the
Plugins folder.
Contents/Resources - inside this folder there are only four files (
layout59.xml.zlib,
layout90.xml.zlib,
layout92.xml.zlib and
Platforms.xml.zlib), unlike the kext from InstallESD.dmg, which have all the rest layout files (70 files) and the
English.lproj folder.
I wonder if this is the same situation with the other kexts, but in this case
AppleHDA.kext from the 10.8.4 combo update is not whole!