Good question. I'd guess at least it would depend on what data the browsers place in the Windows Registry; you wouldn't want them overwriting each other. So perhaps try installing one, make sure it runs correctly and remembers what you want it to remember, then install the other, and see if the first one breaks.
Thank you sir, I was curious if you will get a “this browser/app is already installed” block? I don’t remember if windows does this or not when you try to install the same app twice.