Art is not about creativity and creativity is not just about art or design. Creativity is the mental capacity to generate novel and useful ideas and the ability to develop and communicate them. Creativity exists in virtually all displines and areas of work and not just in art. 
Artistic ability is the skill of using art techniques in painting, sculpting, drawing and others. Creative ability is the skill of using imagination to generate ideas and develop them and apply them in the real world. One does not to be creative in order to be an artist. Art may or may not provide a free space for creativity.