Can I change the order of questions without losing collected data?

Hello. I have a survey that requires a lot of very specific data. After sending it out and having it open for a while, we got a very low response rate. We would like to modify it a bit and then try to get more responses. One of the things we want to do is reorder some of the questions to put the higher priority ones further up top as this is more likely the data someone will have if they don't have it all (no Q is forced response). Can I move questions around and modify without losing any existing data? TIA!