The more you know.
Mountains rise in the distance stalwart as the stars, fading forever.
Roads ever weaving, soul ever seeking the hunter's mark.
You can also differentiate them based on fur on ears, some cats have less fur around the inner ear, while some have more.
And last, but not least, whiskers, how long they are and the colour, as some cats have white whiskers while some have whiskers similar to fur colour.