The similarity is that the Earth is in the center of the Universe, the planets move in spheres, the extreme sphere is the sphere of fixed stars. The difference is that in Aristotle the planets are fixedly fixed on spheres, while in Ptolemy the planets rotate counterclockwise around the axis.
Aristotle presented the model so that the center of the universe was the Earth, and all the objects of the solar system revolved around it, and Ptolemy believed that the center of the solar system was the sun.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.