I mean, that's all true, and yet they're still light-years ahead of the US...
Also, in guessing this was made by an American, because nobody outside of there would call left parties liberal. Liberal parties are to the right, it's just that the US doesn't actually have an actual left.
In practice, no. In theory, liberals believe in the free market while the socdems do not. But both will defend the market as such, which is why socdems are ineffectual and easily duped by bourgeois interests.