Plastic rod guide for truth 31402 multi point lock

Sure thing! This part is called a tie bar guide. Yours in particular looks like our 39-448. I think this will work perfectly well for your window, but let me know what you think.

Yep, pretty much. The design is a little different but in my experience they're more or less interchangeable. These are very simple parts that serve a very simple function, so the difference in design isn't a big deal.