XX4Worlds or XXX4 G+ PLEASE HELP!!!

[merminator]

A guy at my track has what he says is a XX4 Worlds with a saddle pack chassis. Is this newer than the XXX4G+ ?? Someone please give me some help if this is the car to buy. It is very reasonably priced and in good condition. Thanks if someone could give me a hand. The seller thinks this is the good one to have but I dont know if it's like 4 or 5 years old?? Is this the one Dustin Evans and Chambers run??