I remember when the fountain lazer could hit you when you were close to the inhibitors. They're fine now they don't differ in any way.
Please play a custom and see it for yourself. They are very clearly uneven- which is unfair and not fun. It might seem like not a big deal, but it makes a huge difference once the fight gets to the nexus. Just today, a Gragas ultied 2 enemies into our fountain laser on the left side: they were barely 1/3 of the way up and got toasted by the laser allowing us to rush their base and win. I know it would not have worked if we were on the other side. It honestly ruined the game because the team we faced deserved the win.