I'm not an IT wizard but the truth is that no one REALLY knows for sure. Educated guess would be that yes, when you get banned on an IP it will most likely draw attention to the other account on that same IP and you will get chain banned. That's not always the case though, especially depending on what you are botting. I'm currently running 2 bots on same proxy without VIP, and I am expecting a chain ban if I get caught.