I'd be interested to see how that is measured... dogs and cats are significantly different, but I'm not sure I'd call cats less intelligent. Case in point with mine - she figured out how to weaponize my electronic stand-up desk as a way to get me to stand up so that she could steal my chair. Another figured out how to open doors so he could go wherever he wanted in the house. No, they don't go around sniffing out mines or earthquake victims - they instead have convinced people to give them a total life of leisure.

There's another part to their intelligence I wish we could study... multiple times I've had cats show up on my front porch as though they somehow know my house is safe. Example: several years ago a cat knocked on my door and by the time we got things detangled we understood that it lived several blocks away and likely had been in a really abusive situation. Somehow that cat understood that if came to my house it would be safe, whereas my neighbors on either side would have at best ignored it. I've now had this happen multiple time such that there is some kind of pattern - pheromones?