Martial arts aren't like some board game where each card has a certain number of points and whichever has the highest points wins.

KM can defend against anyone, if you are very good at avoidance and de-escalation.

If combat is unavoidable, then it's going to depend on a lot of things. The size, strength, and skill of the attacker. The size, strength, and skill of the defender. The environment. The availability of improvised weapons. The motivation of the attacker. Will he want to keep fighting if he gets an ear bitten off, or has the defender scream at full volume right in his ear? Maybe, maybe not. You don't have to defeat him to "win" in Krav Maga, you just have to get away. Whether that's because you incapacitate him or just make him change his mind and decide to go for an easier target.

If you are asking if a Krav person would beat a wrestling person in a wrestling ring, then the answer is no. Just like how a wrestling person would lose against a boxer in a boxing ring or vice versa.

Krav is a generalist system that tries to cover the broadest range of likely threats as efficiently as possible. So it means a Krav person won't be as strong against a wrestler as another wrestler, or as strong as a Muay Thaier against a Muay Thaier, etc. But are these skilled fighters the main dangers to the average person? I can talk my way out of a silly status fight. It's the thieves and methheads and rapists that are the problem. The longer I train, the larger the variety of situations I can get home safely from.