Can you mix different brands of rust proofer?

[TR4man]

I have for many years used Waxoyl as my rust proofer of choice and every couple of years I top up the cavities.

So many people are telling me that there are better products and in particular those by Dinitrol and Bilt Hamber

Would there be any problems with using a different product over the old Waxoyl? Would one react with the other?