I am trying Model Master Acrylics for the first time and will be painting a Tiger I in three color late war scheme. The base coat of course is Dunkelgelb but are the other colors Schokoladenbraun and Olivgrun??

the official colors, IIRC, were rotbrun and dunkelgrun. But, given the various aplication methods and dilution ratios and lack of many color photos and even then, the effects of processing and the angle of the light, the exact shades of brown and green are permanently debatable.