Is there any difference in pet Homoeopathic remedies than the ones you buy from the local health food shop?

I have been buying Hepar sulph 30c from a pet store online,for my dogs for a few years now, i have run out and they sell Hepar sulph in 6c in my local health food shop, i wanted to know if i can use these for my dog also what would the doseadg be for the 6c, thanks Suzie