[CentOS] Combining CentOS 6.1 DVD images

I would like to create a single installation directory from the DVD1 and DVD2 CentOS 6.1 release DVD images, suitable for network (NFS) installation.

If I mount each of the ISO images and copy their files to a single directory, will that work?  That is, are the files on each DVD unique such that I won't be overwriting any files from DVD1 when doing the DVD2 copy?  

Will pointing a CentOS network installation (CentOS-6.1-i386-netinstall.iso) at this directory satisfy it at runtime for the files needed to do a full 6.1 install? 

Thanks.