Where they differed was that Hegel thought that historical processes and movements were embodied in the world of ideas, while Marx maintained that historical processes and movements was embodied in the material world-hence, Hegelian "idealism" vs Marxist "materialism."
There's a quote from Marx that says (paraphrased) that, "man's reality does not come from his consciousness, but his consciousness comes from his reality." That "reality" was the material reality of economic and social relations. From there, Marx theorized his conception of class struggle as a historical phenomenon. Basically, Marx used the same method of analysis as Hegel, but he came to the opposite conclusion from Hegel about the relationship between ideas and material conditions. For Hegel, changes in ideology (ideas) were responsible for changes in the material world. For Marx, changes in the material world (economics and power relations) were responsible for changes in ideology (Hence, Marx's famous quote: "The ruling ideas of any epoch are the ideas of its ruling class." )
That's my relatively crude understanding of the differences, anyway...
Hope that made some sense?
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