Sim, a utilização do último adprep
será atualizada corretamente. De Executando o Adprep.exe no TechNet:
Adprep.exe is a rollup of all previous versions of this tool. In other words, if you currently have domain controllers that run Windows Server 2003 and you want to add domain controllers that run Windows Server 2008 R2, you only have to run Adprep.exe from the Windows Server 2008 R2 operating system disk. It is not necessary to run the version from Windows Server 2008 because the version in Windows Server 2008 R2 includes all the changes from previous versions.