There is a similarity but the other sounds overlaid do make them sound quite different. WHat I found remarkable is I have always regarded Eno's music as laid back (not sure how to say what I mean) but listening to the 2 songs together, Eno's sounds much more upbeat than Bowie's.
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Baal
I smile and go off waving
(Amiably) - for that's my way
http://www.helden.org.uk