tim - I think if the water temps at 3 ft to the bottom are measured, the temps of your neighbor's pond will be noticably warmer than your pond. I am guessing your pond temps from 3-4ft to bottom are 39-40F and those of your neighbor's pond are around 44-48F enough of a difference to stimulate active trout feeding.

aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management