The difference between Fitting and Fixing to

Fitting is also noun with the meaning: a small part, especially a standardized or detachable part of a device or machine.

Fitting is also adjective with the meaning: ready, appropriate, or in keeping.

Fixing to is also verb with the meaning: going to.

check bellow for the other definitions of Fitting and Fixing to

Fitting as a verb:
Fitting as a verb (informal, US, with infinitive):

Getting ready; preparing.

Examples:

"I'm fitting to go home and sleep."

Fitting as a noun:

A small part, especially a standardized or detachable part of a device or machine.
Fitting as a noun (engineering):

A tube connector; a standardized connecting part of a piping system to attach sections of pipe together, such as a coupling
Fitting as a noun:

The act of trying on clothes to inspect or adjust the fit.
Fitting as a noun (manufacturing):

The process of fitting up; especially of applying craft methods such as skilled filing to the making and assembling of machines or other products.
Fitting as a noun (chiefly, _, British):

A domestic moveable piece of furniture, which can be taken along when moving out, US furnishing (see also ).

Examples:

"the fittings of a church or study"
Fitting as a noun (uncountable):

The action or condition of having fits in the sense of seizures or convulsions.

Examples:

"Since her medication was changed, her fitting has got worse."

Fixing to as a verb (Southern US, Appalachia, and, AAVE, informal):

Going to; preparing to; about to.

Examples:

"It's fixing to rain. I'm fixing to whoop you if you don't shut up."