Re:Truck purchasing advice please
Welcome to Road Food.
No two trucks are exactly the same even new from the factory.
And yes I know you said "similar quality" but there is a lot to check on any two trucks. Engine, Transmission, Millage, Tires, Length, Paint, Interior, Gauges "working or not" and the list goes on and on.
But if your asking if you can or at least should be able to buy, cut, install a slider window for 2 K hell yes. Challenger Windows and door in Indiana is a company that offers good custom made products and installation at a very good price. Lots of threads here on this topic, go to the top of the page and do a search.