You mean non-enchanted vs enchanted?
ie
http://lucy.allakhazam.com/itemlist....tinum+necklace
If the HP/mana formulas were pulled from the EQEmu source and give incorrect results then they've been tweaked on p99. It seems the policy not to release any specific game mechanics information (as in live) so your only way to do this is to fit the formulas given enough player data.