It's okay, Ink, I am sure, Mike doesn' mind. And we were all once ignorant to these vehicles at one point.
Aahh fucken hate my internet is down at home or I woul post up pictures to show you guys what I am talking about.
Anyway, on to your questions. No the NBS clusters will not fit into the OBS models. OBS Escalade/Limited/Denali clusters are interchangeable with any OBS model. These clusters come with white needles, speedometer goes up to 120mph, RPM limit goes up to 6K and the overlay is a teal color. I have seen some OBS which were not an Esc/Lim/Den but still had the teal overlay, which is the case with my Hoe. This poses a problem because if I wanted red gauges by installing red LEDs the teal overlay would create a purpleish look. On pretty much most clusters the overlay is a white, you can easily switch to blue gauges or any other color by simply replacing the old bulbs with blue LEDs and so on.