The dorje and bell have levels of meaning, but indeed relate to the swastika, which in Buddhism represents success, good fortune, and the union of the two forces. I would not say they are interchangeable, since they represent different stages of a process. In terms of Kabbalah, this can be related to how the superior forces in Atziluth divide in two, then unite to create in Briah.
"Do not worry; cultivate the habit of being happy." - Samael Aun Weor