How would you go about describing the difference between the spotted leopard and the spotted jaguar? (I say 'spotted' here because both species have solid-colored types.)

I'm just curious in hearing how you, as writers, would describe the difference between the jaguar and leopard spots. I would say the jaguar has a spot within the spots and the leopard doesn't. I'd love to have a more sophisticated (or clinical, even) way of describing the difference between the two types of spots.