The list of approved cards on p207 does not list >ProSpec cards (although there is a refernce to Professional >brand - any relation between Professional and ProSpec?)
No! The Manual is referring to Lexar Professional SDHC cards. The ProSpec cards have a lifetime warranty so you should have no problem exchanging it for another one. I would recommend trying the new one out in the store to make sure it works correctly just in case. Good Luck and Enjoy your Nikons!