+1 on what TJ said. Can you talk more about your racing plans at this point? Sounds like you might be on a smaller budget, which is fine (most of us are) just want to make sure the guidance we give is in line with your goals.
Off the cuff, a 2002 kart may be a problem for some tracks that require modern bodywork. There were some changes around 2003 and then in 2008…
At that era and age of 2002, condition probably matters more than brand. If you have pics that would help too of course.
There’s some information on identifying (verifying) the age of a kart here:
Not all karts have a homologation plate, but for those that do… this will help you verify it’s age… A lot of older karts get passed off as newer ones. Not necessarily though malaise, just the owner doesn’t always know what the have and are just going by what they were told.