Laplace in electromagnetics(voltages are different in conductor?)

as you see this example and solution

if we assume the R of conductor sphere is 5m and check voltage in different z we obtain(for example z=1m and z=2)

and as we know in conductor we doesn’t have voltage differences so this equation should be the same

but voltage aren’t the same

why in the conductor sphere voltages aren’t the same? or i do mistake to understand this example

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