This is not possible. If you set your outside interface IP to (lets say) 1.1.1.1/30 and then try to set your inside interface to 1.1.1.1 you will get an error message stating something like it is already assigned to another interface (don't remember the exact message). So you would have to have different IP addresses for each interface on the ASA (that includes subinterfaces.
In transparent mode you can set one management interface IP that will be on the same subnet as both your inside and outside networks.
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