No, it's not. I believe what they called the "breezeway window" only came on the Park Lane model of that car. I saw one last year that had it, but the car had just been rear ended, so that depressed me some. Also the breezeway window was almost straight up and down, so as to not take up too much room. If the window in the back of mine went down, it'd take up a bunch of trunk room. That's why the breezeway windows have different roof lines than the others. I like the low angle fastback look of the solid window models better anyway.
As per my father, the Marauder badge was basically only a trim package option back then. The car just happened to have a fair amount of horsepower. Each model had that option, so you could get any of the following:
Mercury Monterey Marauder (had one a few years ago)
Mercury Montclair Marauder (the one I currently have)
Mercury Parklane Marauder (can't say I've actually seen one of these, as most Marauders were two doors)
Hope that clears things up a little.