Define the “difference.”
Classical liberalism is defined as: “a political tradition and a branch of liberalism that advocates free market and laissez-faire economics; civil liberties under the rule of law with especial emphasis on individual autonomy, limited government, economic freedom, political freedom and freedom of speech.”
Today’s leftists no longer believe in free markets, civil liberties for those who don’t agree with them, limited government, economic freedom (for those they don’t agree with), political freedom (for those they don’t agree with), or freedom of speech (for those they don’t agree with).