Dunno, you need to check it out. Earth and neutral are strapped together and so should be at the same potential. However, they may not be strapped together well or the connection could be a long way off. Voltages can then be induced onto the neutral line by equipment, fridge motors, washing machines etc. and I don't mean yours, they could be anywhere on the system.
On a slightly different topic. These voltages are often a cause of poor quality sound on hi-fi systems and enthusiasts go to great lengths to isolate them.
Since I'm fairly remote, my earth and neutral are connected at the pole, next the the transformer in my garden. My hifi sounds good, except when the hairdrier is running.
There maybe a clue in your last post.