As rhythm and Latin both look like similar dance styles, they do have some major differences. One difference in the rhythm style is that in the action you step onto a bent leg where in Latin it is commonly danced on a straight leg when weight is shifted. Long story short, in rhythm you focus and highlight the knee action and in Latin you highlight and focus on the foot action. 

There is also a slight change of dances in each style. Rhythm dance style has Chacha, Rumba, East Coast Swing, Bolero, and Mambo. Latin dance style has Chacha, Samba, Rumba, Pasodoble, and Jive.