What's the difference between disburden and disburthen?

Disburden

Definition:

• (v. t.) To rid of a burden; to free from a load borne or from something oppressive; to unload; to disencumber; to relieve.
• (v. i.) To relieve one's self of a burden; to ease the mind.

Example Sentences:

Disburthen

Definition:

• (v. t.) To disburden; to relieve of a load.

Example Sentences: