It is, most times it is the Fromm's with one other Grain Free but depending on when I get low, could be two other different Grain Free which they get morning and evening. I have never had a problem with changing foods, which was the purpose… I can go most anywhere and know if I needed to buy food for them, I am not limited to just one brand.
Also I mix in homemade Mutt Loaf for the evening meal. They get usually some canned with the kibble in the morning with yogart and cottage cheese at lunch time (which is just a cookie snack).
I have to admit however, when I first started doing this, I was a bit careful. When it came time to mix in a new/different brand, I would start for a day or two just throwing in a small bit of the new brand with the kibble but once I was through a couple of different brands, it really was not necessary. They are really used to change and different things from kibble to canned to raw to cooked. Makes it pretty easy to feed them. I am sorry that I didn't do this years ago with my very first Basenjis.