Are the emphasized Sunnahs rewarded more than other Sunnahs?

The confirmed Sunnah prayers carry a greater reward than other supererogatory prayers, due to the Prophet's consistent observance of them, his encouragement of them, and his command regarding them. Each of these aspects indicates the greatness of their reward. Furthermore, the confirmed Sunnah prayers have a special merit of their own, as in his (peace be upon him) saying: "Whoever prays twelve rak'ahs in a day and night, a house will be built for him in Paradise on account of them."