What best describes the substances represented by these two diagrams?

We see that the compounds have the sane atoms in their formula, however, thery are not the same because we cannot move the one of the top on the other so that all atoms are the same,Specifically, the CH in the first case are not adjacent, while in the second case they are. They are constitutional isumers because they use the same chemical atoms in the same proportions. But thier arrangement is different.