No, because the schema upgrade for 2008 R2 includes the older ones.
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> hello. I have a win 2003 domain. using dcpromo i promoted a Win2008 R2
> server, after running forestprep and domainprep
> This was for test reasons and using dcpromo again i demoted the R2
> making it a workgroup machine (not member server).
> Now that i want to promote a Win2008 server (not R2), do i have to run
> forestprep and domainprep again?
> Regards, Peter