You can check the macOS version and build number included in the installer by runningYou can also check the version number of that 10.14.6 app full install download.
Code:
hdiutil attach /Applications/Install\ macOS\ Mojave.app/Contents/SharedSupport/BaseSystem.dmg -noverify
defaults read "/Volumes/macOS Base System/System/Library/CoreServices/SystemVersion.plist" ProductVersion
defaults read "/Volumes/macOS Base System/System/Library/CoreServices/SystemVersion.plist" ProductBuildVersion
hdiutil detach /Volumes/macOS\ Base\ System
You can still get 10.14.5 by running
Code:
open "x-apple.systempreferences:com.apple.preferences.softwareupdate?installMajorOSVersion=10.14.5"