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You can then easily change the OS version and have the same list of packages deployed. This assumes that you are using the recommended DeployStudio method of using packages for everything, even the OS. And it's easy: Download the OS from the Mac App Store, drag it into AutoDMG Opens a new window. Once your NetBoot image is up and running, you can create a new OS image. The NetBoot OS volume must have a different name from any other volume that might be mounted on the Mac. If you leave the NetBoot image at the default name of "Macintosh HD" the NetBoot image will not work. If it all works, rename the volume on the Mac you used to create the image back to "Macintosh HD." It is critical that you rename the hard drive on the Mac when capturing the image and rename it back. Test it on another iMac (as well as other hardware.)

Capture the Image with the image capture tool, and upload to the server. Take one of your iMacs, rename the hard drive to something like "NetBoot Image" and customize it with the software, tools, and settings you want when NetBooting. So you absolutely have to update your NetBoot image to the OS that shipped with your new iMacs and update your OS image accordingly. The OS bootstrapper/installer will see the Mac hardware version, check to see if it is supported hardware, and go " NOPE!" Apple does not back port hardware support to old OS versions. But whatever way you cut it you can't deploy/run 10.9.5 on the new iMacsTo reiterate, there is no possibly you can downgrade the OS on a brand new iMac to 10.9.5.