I hope you can at least acknowledge that they have many differences, starting with the most relevant difference of all: Freedom. Hell, free markets actually incorporate the word "free" within its title. You even use it as well.
Communists also like to talk about freedom. They just made distinction between "negative freedom" and "positive freedom". I had to learn it in school (in Communist Poland) and I must admit that their distinction looks much smarter than free market slogans. You freemarketeers make Communism look good!
Negative freedom is when you are allowed to do something, positive is when you are able to do something.
So you have the negative freedom to fly, but only the positive freedom to walk. So in free market the worker has negative freedom to stop working, but only independently wealthy has positive freedom to do so. Marxists claim that the positive freedom is much more important.