Hey there! If you look at the equations, they are just the same as the base equation when you try to manipulate it and make the coefficients whole numbers.
For the first one, the reactants and products are just the same with the base equation so the Kc would be the same.
For the second one, the reactants and products were reversed so you may want to get the reciprocal of the original Kc to obtain the appropriate Kc, which would be equal to 416.67.
I hope this helps!