No, leopards have different patterns and a jaguar has no pattern.
Jaguars are stockier built, and the rosettes on the flanks have spots in them.
Leopards and Jaguars are totally different species of cats, generally under the family of "Panther". Panther family includes the Tigers, Lions, Jaguars, and Leopards, or the "big cats". "small cats" are under the "Feline" family (these are not the scientific names, but the regular common names of the family)
Leopards usually are sleaker and narrower of the face, and the spot patterns around their heads/shoulders are non-enclosed spots. Jaguars are heavier blunter faces, and their patterns around the head/shoulders are usually enclosed circles.