CAT LOVEPURR

Is it okay that I mix two types of dry food for my cat?

I will be away for 2 weeks and have organised with a cat sitter to look after my pet cat, who is 12 yrs. old. Because she becomes stressed easily, the Vet has, in the past, put her on Royal Canin, Urinary S/O, Feline, for her urinary infection.
Her usual dry food is Innova for Seniors. So, is it ok that I mix both these, and perhaps have more of the Urinary S/O, so she does not get the infection?
I have, from time to time, mixed the two, but have not given it to her in one stretch. Just a couple of days a week or so. When she was suffering with UTI she was completely on Urinary S/O.
Thanks in advance.

If you think your being away is going to affect your cat, mix the two dry food and ask the cat sitter to begin feeding the cat with this, and then gradually move to just the Urinary S/O till you return.
Also, you might ask your Vet for advice.
Hope this helps.