Castlevania Dawn of Symphony (Alucard SOTN Hack) is a ROM hack based on the original Castlevania games, specifically drawing inspiration from Symphony of the Night. This adaptation would mean changes to gameplay and story elements to incorporate elements of the referenced game, but the base foundation likely originates from a pre-existing Castlevania title.  It's not a Konami product, instead created by members of the ROM hacking community.

Castlevania Dawn of Symphony (Alucard SOTN Hack)

Castlevania - White Night Concerto (J)(Eurasia)