Newbie welder question.

I just ran out of wire in my new welder I have been using .030 that came with it. I just purchased a spool of .035 and another .030 just cause I wanted to test out the difference see what worked best for me. I also purchased a new pack of .035 tips to go with it. My question is can I use the .035 tips with .030 wire or do I need to use the exact size?