How Much Does the Python Version Installed on Your Computer Matter when doing USACO submission

I was wondering how much does the Python version installed on you computer matter when doing USACO competitions and submissions. Since, right now I have Python 3.9.5 installed for a class. I was wondering if I submit Python files on USACO, would that be fine, or would I have to reinstall a Python version that is only supported by USACO?

It barely matters.