I recently asked if anyone could photograph the missiles from the toy Spectrum Pursuit Car and the SWORD Scouts made by Century 21 Toys. Arto from Helsinki Base came to the rescue and they are not the same after all! Doh!
Heeding your call for the C21 missile comparison, here are the missiles for Scout 1 (left) and SPC side by side. And lo and behold, not only are they different in size and design, but the smaller the vehicle the bigger the missile! The Scout one measures 28 mm whereas the SPC one 24 mm. Also the end seems to be much rounder in Scout 1.
Hope this helps.