I'm sure that if I look around hard enough (and probably not that hard) I can find instaces of people confusing bytes with bits. How many times have we (incorrectly) said "CPU" instead of "processor"? My guess is every time. How about RAM? How about Linux? It's not like we are all trained and experienced computer engineers in here... Not everyone knows memory refers to "RAM", not everyone knows their hard drives have 1TB of space instead of 1Tb.
Confirming if they are the same person shouldn't be that hard. Admins have access to people's IPs. Unless this is a very dedicated troll and is using proxies to login, finding out would be just a matter of time.