Quote from Microsoft reimaging rules
One key benefit of licensing Microsoft software under a Microsoft Volume Licensing program is that customers can use Volume Licensing media to deploy the same standard image of software across multiple licensed devices. It does not matter whether those devices are licensed under that particular Volume Licensing program or through OEM or FPP. Using standard images can help with:
More timely software deployment.
Reduced total cost of ownership (TCO) through easier deployment.
Standardization of software on multiple devices and streamlined product activation.
Reimaging is permitted if the copies made from the Volume Licensing media are identical to the originally licensed product. Volume Licensing customers who have licensed Microsoft software products from an OEM, through a retail source, or under any agreement other than their Microsoft Volume Licensing agreement may use copies made from Microsoft Volume Licensing media. Customers can use these copies from Microsoft media only if they are the same product and version, contain the same components, and are in the same language.