What’s the difference between a Feist and a Mountain Feist?

What’s the difference between a Feist and a Mountain Feist?
A Mountain Feist is one of two recognized Feist breeds by the UKC and CKC, whereas the term “Feist” can refer to both registered Feist breeds and a category of small, mixed-breed terriers bred to hunt and tree small game in the southern U.S.
Mountain Feist dogs are small, active, and agile and were bred to hunt and tree squirrels in the Appalachian Mountains. According to the UKC breed standards , their body should be slightly longer than tall, and their legs should support quick movement and agility over mountainous terrain. The breed standard describes the Mountain Feist’s head as proportionate to the body and “blocky, with a broad skull, a moderate stop, and a strong muzzle.” Their ears are v-shaped and should stand upright by their first birthday.