Serendipity and Synchronicity Same Same? Or Different?

Serendipity is characterized by the presence, or absence, of conscious intention.

Both of them involve observation; an apparently acausal, yet synchronous, relationship between inner and outer events.

Synchronicity reconnects the self in a meaningful way with the world via a mutual resonance that redefines the sense of self.

Serendipity, alternatively, defies an observer's knowledge by disconnecting an existing articulation of self and world by the appearance of an anomaly or error, and then challenges the self to reconnect to the world in a new meaningful way.