Oooh regular yogurt.. okay!!
I guess if you do not follow the direction your chicken makhani will be very watered down and it will not taste same as you are looking for.
And if you cook it too much then the chicken and all the masala in it will turn into halwa.
Just my two cents from one year of full time cooking experience and many many years of part time experience cooking experience of desi foods.
Good luck.