The basic structure of a compare and contrast essay point by point is the following:
1. Introduction with thesis statement
2. First point that is similar for both objects (smell, for example)
3. First point is that different for both objects (color, for example)
4. Analysis of both objects (how they differ and yet are similar to each other)
If your essay should have no paragraphs, you can add a separate paragraph for each point that is similar or different.