Downgrading iOS

I have a SE 3rd gen that is on its last limbs after getting smashed. I haven’t updated it in years and am still on iOS 15.4. I recently got a new 3rd gen and would much prefer to stay on the old software. Is there any hope for being able to install it. It is a completely blank phone as of now. Could someone online have the code saved and somehow transfer? I’m not good with tech and everything that I’ve read says that it probably isn’t possible, but if there is any hope I would love to hear it.