Are sunroom windows much the same as regular windows?

I am looking at enclosing in my covered deck to make with windows to make it into a sunroom. Would I be looking at a regular window company to supply the windows, or are they specialty windows? I have a solid half wall railing already, just like the photo. It will but up against the siding, also just like the photo

I am looking to do something similar to this:

{{!gwi}}