Components of verious WINDOWS desktops

in A+
Just a quick question. I was wondering if all the various components of the modern WINDOWS desktops, (95,98,98SE,NT 2K,XP.) are basically the same. I am not sure since I have only used 95, and ME.
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A+, Net+, i-Net+, CIW-A
MCP NT4, MCSA 2K, MCSE 2K