Sorry, but this is just horseshoe-theory Enlightened Centrist nonsense.
Methods? No. The far-right relies on terror, fear, and explicit power structures such as a police state to maintain power. Leftists oppose such structures, even on the ultra-left.
Objectives? Absolutely not. Right-wingers seek to maintain Capitalism, the far-right seeks to implement fascism as a reactionary protection of Capitalist hierarchy, complete with racial and gender hierarchy. The extreme left, ie Anarchists and Communists, seek a Stateless, Classless, Moneyless society based on horizontal power structures. Completely different.
Goals? Same as objectives.
Horseshoe theory is absolute nonsense, and is used to protect the status quo even if the status quo must be radically changed.