Yes, you could say that.
C= 2WD, 25= 3/4T long bed, 4= pickup, 5= 1965
The 2 is 3/4T. the 5 is long bed. This is the VIN code system. The trucks were also had a series system C10, C20, K10, K20...... 1/2 T VIN was either 14 or 15 (short or long bed). No short bed 3/4 available.
They were also known by a model number: C1434, C1534, C1404, C1504, C2534, C2504...... Kxxxx, etc. This designated long, short, fleet side and step side. Too many numbers!!!!!!!
60-64 has a different set of designators/VIN than 65-66.