Vampiric Regeneration

[Pimple]

Vampiric Weapon: Any living opponent struck by a vampiric weapon must make a Fortitude save (DC 16) or lose an additional 1d4 hit points, which are immediately added to the wielder's current hit points total. Any hit points above the wielder's maximum are treated as temporary points (multiple additions of temporary hit points don't stack) and disappear after 1 hour.

Weapons with Vampiric Regeneration enchantments only regenerate hitpoints when striking a opponent.

When roleplaying on BGTSCC should we consider these two to be the same?

[DM Soulcatcher]

Yes, you can consider those to be one and the same, however you need to remember that nwn2 mechanics of the property don't allow for temporary Hit Point gain.