[mrjokerq8]

Thread title says it all, whats the difference? and if i have a botnet, can i have total control over a persons computer?

[ZiRw]

It depends, a botnet is just a network of compromised or infected computers.
A RAT is a remote administration tool, you can pretty much do anything to their computer.
There are a lot of different types of botnets out there, some for DDoS, and some for stealing passwords etc..

[DestinedForGreatness]

Thread title says it all, whats the difference? and if i have a botnet, can i have total control over a persons computer?

They can be by very similar, or very different

It depends what capabilities each software has.

Some bothers give you a lot of options over the infected machine, whilst others don't.