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I have not used ClassicWB, but generally speaking Workbench does not have any concept of an "icon theme". So all icons have to be swapped one at a time, manually.
It's possible to make a script or installer that could replace the standard Workbench icons automatically - assuming everything is still in the default install location - but you'd still need to fix the icons for everything else yourself.
Those isometric icons are GlowIcons, used in 3.5 and 3.9. NewIcons is an earlier set in a somewhat similar style.
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