Full Idea
These days most philosophers of mind suppose that most psychological properties are multiply realisable.
Clarification
A thing is 'multiply realisable' if it can be implemented in more than one physical way (e.g. a switch)
Gist of Idea
Most psychological properties seem to be multiply realisable
Source
Jerry A. Fodor (Jerry A. Fodor on himself [1994], p.298)
Book Reference
'A Companion to the Philosophy of Mind', ed/tr. Guttenplan,Samuel [Blackwell 1995], p.298
A Reaction
This is just speculation. The physical part may seem very different, but turn out to be identical in the ways that matter (like a knife made of two different metals).