Those years are very similar. Positive identification could be done by serial numbers.
They are bothe twin rotor aircraft. The biggest difference visually is the 46 has tricycle landing gear (1 nose wheel and 2 mains) and the 47 has Quad ( 2+2).
46 ford the park lights are under the headlights 47 fords the park lights are in the grille sorry dont know about a 48
46/47 is in its simplest form.
47 - 93 = -46
47
45 + 46 + 47 + 48 + 122 = 308
47
-47
46 + 47 = 93
45 + 46 + 47 + 48 + 107 + 108 = 401
46
Their product.