Hare Krsna, Dandavat Pranam HpS Guru Maharaj.
Please accept my humble obeisance unto Guruji's padmacharan that I am trying to answer the question of the difference between Gayatri Mantra and Kama Gayatri.
There is no difference between Gayatri Mantra and Kama Gayatri but omitted kling in the Gayatri Mantra.
We should chant Kama Gayatri Mantra before chanting Hare Krishna Mahamantra. There is no difference among mantras, names, rupa, guna, Murti and Swarupa.
Your fallen servant,
Yamunesvara Das
HpS - AgtSP! To our understanding, what is commonly called the Gayatri Mantra is, "om bhur bhuvah....". Many groups chant it. Some as Kirtan, although we only do it as Gayatri and men with the sacred thread.
Look at: https://vedabase.io/en/library/cc/madhya/8/138/
Srila Prabhupada gives Himalaya mountain explanation of all these things following Krsna Das Kaviraja!
O.K.?
We chant all the Gayatri Mantras on our sacred thread at dawn, noon, and dusk, daily. No formal relation to when we chant the Mahamantra eg. chanting before we do Maha mantra Japa.
Thank you!