key differences: The downslope in most bubbles is twice as steep as the upslope. For bitcoin it was half as steep. Bubbles typically drop below the pre-bubble price.

One possible reason for the differences: Bitcoin speculation is less of a leveraged instrument than most other speculative activities. This is about to change as Bitcoin makes it onto ETFs (where leveraged investors can play more easily) and if potentially leveragable contracts (like ripple) gain in popularity.

That is, if you believe Kindleberger's thesis in "manias, panics, and crashes".