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If you're going to upgrade your servers, you'd probably be better off just going with the latest FlexLM. Our IT folk flagged my Creo 4.0 era license server as a security risk. I worried about compatibility with older versions of Creo and the latest license server, but was informed that things work fine.
Here's the discussion I had on here pertaining to FlexLM upgrades:
I read this already 🙂
I might be wrong, but the header at the table says: FLEXlm/FLEXnet Server Version (Shipped)
It does not indicate clearly, that this is required for each Creo version.