Hi Marcus, thanks a lot for your tip.
The thing is, that with the sliders you cannot reach the very exact position.
I found another way, what works perfect, but is a bit complicated and needs another software, in my case Cinema4D, and GoZ:
Requirement: There are two meshes with exactly the same point/poly number, but different shapes. I call them »original« and »target«
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Export the original via GoZ to C4D
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Delete the original (subtool) in ZBrush
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Target mesh: store Morph Target
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Export the original back to ZB from C4d
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This comes to, that the deleted original reappears again
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Delete the original once more
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Rename the target mesh with the name of the original
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IMPORT the original mesh to the target from the User=>for all users=>pixologic=>GoZProjects=>Default-folder (there you will find a .obj)
This will import the original mesh exactly to the old position. As you stored a Morph Target, now you can switch between the two shapes.
Got it? 
Viele Grüße,
Stephan