In Russia, they have only 1 party left, so the party clearly doesn’t matter. In Usa, it is not an official dictator yet. In other countries with a dictatorship, I don’t know about their parties. So do you know any examples where the parties still matter?
Authoritarianism isn’t an ideology per se, and often dictatorship isn’t official. Even Stalin was the “general secretary” of his party. And yet, authoritarianism of every stripe demonstrates similar styles regardless of their political ideology. Smashing dissent, regressive economics and consolidated power, militarism, etc. These have never been solely the purview of avowed fascists. So no, for most of those that suffer under dictators, the ideology of those thugs rarely matter.
But make no mistake, a multi-party democracy with varied ideologies is not the opposite of authoritarianism. Factions can be just as much a poison pill, if the balance of powers are not subordinate to an informed electorate. The opposite of authoritarianism is anarchism.
Just take a look at the countries that have the word “democratic” in their name. Seems like that’s the unofficial way to let everyone know exactly how authoritarian the country actually is.
But anarchism is the opposite of all governance while authoritarianism is a subset.