The 207 has two front pax doors; The 206 just one.
Also on the 206 is a switch on the rear door that will prevent the electric flaps from lowering when the door is open.
And the landing gear struts are different: The 207 is the typical oleo/bungee type (I think), but the 206 is more like a "spring" set up.
Someone better double check that last paragraph; the gear is definitely different but I'm having a hard time recalling the specifics.
