Yes... This has nothing to do with the year and everything to do with the model of the car. The higher priced cars had the nicer trim.

I recall the 115 300D came with the wood trim since Mercedes was trying to convince everyone that a five cylinder engine was really a workable thing. This may sound weird now, but in 1975 it was one of those 'what are they trying to pull here' things, at least in the US anyway.