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You can buy NG or MF, if you buy NG there is an upgrade path to MF. It's worth reading this article to understand more: PaperCut MF Frequently Asked Questions (FAQ) . Becuase the MF version typically involves installing an app on the MFP then you need to get a quotation from your MFP reseller.

As long as the Manufacturer remains the same then there is no additional cost, if you wish to change manufacturer then you can get them replaced at a discounted rate providing that you have valid PUA (premium Upgrade Assurance).