I agree with @cushyno , I've read before that S04 and Liberty Bell are the same, but I would be astonished of it were true.
M36 is slightly fruity, and smells fruity when fermenting. S04 is slightly tart and smells bready when fermenting IMHO. I'm super sensitive to S04's tartness and can often detect it in commercial beer that uses it, while Liberty Bell is probably my favourite dry yeast.
Mind you, I've no idea what yeast it actually is!
M36 is slightly fruity, and smells fruity when fermenting. S04 is slightly tart and smells bready when fermenting IMHO. I'm super sensitive to S04's tartness and can often detect it in commercial beer that uses it, while Liberty Bell is probably my favourite dry yeast.
Mind you, I've no idea what yeast it actually is!