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Sorry, ejaeger, misunderstood your question...but the short answer is canned foam is mostly air and chemicals....real shaving soaps and creams are combinations of soaps, scents and various facial...

This post is worth looking at on soaps. Proves the point that it's possible to get it right with even common products:...

I use both & each brand of cream or soap seems to need different amounts of water and lather-building time; however, once you have either one mixed and whipped up correctly, they work the same, IMHO.