Your original MacPro 2006 system (MacPro1,1) can support upto Mac OS-X Lion (10.7.5)
The MacPro 2007 system (MacPro2,1) can also support upto Mac OS-X Lion (10.7.5). The original OS it had was Mac OS-X Tiger (10.4.9)
The MacPro 2009 system (MacPro4,1) can support upto macOS Sierra (10.11.6). The original OS it had was Mac OS-X Leopard (10.5.6)
So a full install of OS-X Lion will work across all three systems. If that is your aim. You will need to go into Options in the Installer to install all of the drivers Vs the minimum the given system you are setting up will support onto a external drive as the Grey CD/DVD disks you got for your system won’t have all of the drivers the other systems require as a bootable drive or installer (to be clear Apple jumped around so the issue of the disk you have maybe a newer on which did have a full install - Don’t shoot the messenger here). The retail copy of the OS will be a full version.
So lets back wind this … You will need a FireWire drive to create a bootable OS drive with OS-X Lion, then you can copy over to it the OS installer so you can then run it to install OS-X Lion or any supported by the given system OS.
As an example I have such a drive with all of the OS-X versions the MacPro can support and then I can boot up under this external drive to service the given system as needed. It is also partitioned with newer OS’s so I can likewise install them as well when the system I’m working on can support it.
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