Completely different contexts, the Third Reich was born after the humilliations of WWI and the Versailles treaty, there was plenty of territorial and ethnic disputes with neighbouring states, the menace of bolshevik revolutions, a shit tone of rebellious war veterans, exacerbated nationalistic revanchist sentiment, the jewish question and a megalomaniac leader.
In Portugal Salazar was a timid university professor who was invited by the generals of the military coup to run country simply because the republican regime was totally dysfunctional, with a new government every 6 months for almost 2 decades. They don't even seat at the same table in terms of ideology. The Nacional Sindicalista faction was more more aligned with italian fascism and german NS, but like the falangists in Spain they were regarded with suspicion and never had real power inside the regime.