Windows OEM disc must be used with Windows OEM key code.
Windows Open License (OLP) disc must be used with Windows OLP key.
Windows Retail (FPP) disc must be used with Windows FPP key.
If you own an OEM License for those machines (which you do since they have the OEM Certificate of Authenticity or COA) then you are licensed for the Windows 7 Pro and you may use both your Open License (OLP) media and your MAK key which came with the Open License to activate those installations.
All that matters is that you have a valid license for each installation; the media you choose to use doesn't matter, but the key code must match the installation media type (OEM, OLP or FPP).
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