Sir,
Now a days, much people are not interested to know their veda whether rig, yajur or sama. In such electronic period, the mantras given separately for vedas is highly appreciable. People should know their vedas and perform upakarma accordingly. Though, I belonged to Kanchi Mutt, I performed upakarma on 7th itself and I heard it so. The mantras are separate and KANDARISHI tarpana are different for rig people. Unless, one should know it, they cannot perform it. the effort taken by the person is HIGHLY APPRECIABLE. Thanks a Ton and GOD bless you.