Is there a difference? I don't see it.
Yeah I'm hip. That's what I just noted.
The quick example I like to go to:
When we declare "all men are created equal", that's Liberalism in a nutshell. There's probably no more Liberal tenet. We prohibit ourselves from establishing a hierarchy of unequals.
--- When we take that statement and try to force all men to be equal by way of governmental manipulation ("affirmative action"), that is the point where we have left Liberalism and gone to leftism.
Half a century ago fearmongers of the McCarthy era started conflating the two. It was dishonest then and it's dishonest now.