mine is 16390 too, some say they have 16391 so there must be different upgrades depending on what you have.
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion Does BuildLabEx show 10240.16390.amd64fre.th1_st1.150714-1601? If not, do you have KB3074665 installed?
Windows 7 is really weird. Let alone registry tweak, in addition to adding language pack, you need to bcdedit locale for boot menu as well, or an unrecoverable BSOD too.
Are the feedback and support apps removed i would think thats the only difference between these two builds.