similarities and differences between Progressives and Social Democrats?

[The Crawling Chaos]

They seem similar to me, as it seems both believe in a welfare state with economic controls. But neither want to go Full Monty with socialism by completely eliminating private market economics. Other than the occasional progressive, neither seems to want to nationalize industry.


Both want to "use" the capitalists and regulate the economy for the "public good".

Just happenstance, or are there common influences?

This is a follow up to a much earlier question on differences between Social Democrats and democratic socialists.