If you can measure the headtube that will give us the info we need to tell you the size. Marin dont measure their bikes in the "modern" way....they measure the seat tube from the centre of the crank to the centre of the top tube......not the top.
However, you can tell the size of the frame from its relationship to the headtube....
180mm is 20.5" XL
150mm is 19" Large
130mm its 17.5" Medium (although this one changed by 5mm over a couple of years)
This is certainly true from 89 through to 94, which both your bikes fall into.
As somebody else said they are 92 green and 90 light grey.....this can be confirmed, as can the model, by the frame numbers.