Some types like this Aerodrome Control Car had a different paint scheme specified for later contracts (or were repainted during the course of their service).
This International Aerodrome Control Car was first painted airside yellow with a black roof to minimise glare for the air traffic controllers.
"R.C.A.F. Mechanical Transport Vehicle,12 Apr. 1943"
Census: R.C.A.F. No 4925
Source: https://www.bac-lac.gc.ca/eng/Collec...Number=3586779
The next picture shows the same type of truck in a flat drab paint of some sort with white panels.
"RCAF Station - Aerodrome Control Car, 14 Mar. 1944"
Census: R.C.A.F. 35-725 BY
Source: https://www.bac-lac.gc.ca/eng/Collec...Number=3199203