Multipotentialite vs Polymath

Why do we have these two words that seem like they describe the same thing; or are they different?

The word polymath has the definitions:

1. Someone who knows a lot about many different things.
2. A person of encyclopedic learning.

The word multipotentialite or someone having the trait of multipotentiality has the following definitions:

1. A multipotentialite is someone with many interests and creative pursuits.
2. Someone with the ability and preference of a person, particularly one of strong intellectual or artistic curiosity, to excel in two or more different fields.

There are other similar words, but I would like to get a clear definition and distinction between these two words. The similarities between them seem to stem from the attribute of having a diverse interests and conveys an esteemed level of competency and a love for learning. The differences between the two words seems to convey that multipotentiality has a creative twist to it, whereas polymath seems to be based on deep knowledge and understanding.
Are these words the same? If not, what is it that distinguishes them?

Are these words the same? If not, what is it that distinguishes them?