Well, the Mustangs wouldn't be hard at all to tell apart unless you were underneath or directly in front of the planes.
I have to agree with this guy's point--we should have some continuity with our ICONS. There is little visual difference between a Tempest or Typhoon, or between a 202 and a 205, yet they have different ICONS. Yet, strangely, despite the massive visual difference between the P-51's they get the same ICON.
The FW's are even stranger. The 190A's and D have the same ICON, although the D is quite a bit different looking. Yet, for some reason, the 152 gets its own ICON. This makes no sense. A 152 is easy to mistake for a D-9, however a D-9 is a lot different from the "A"-series. If ICONS were really based on how hard it is to identify a plane, the D-9 and 152 would have the same ICON, and all the "A"'s would have a different ICON.
My own guess is the ICONS were originally intended to be based on identification, but HTC basically forgot about this as more important things gobbled up their attention.
J_A_B