That's one of the newer ones. Somewhere in the 90s they changed the design. The TNG ones didn't have the oval openings on the back side and were all enclosed there. You can find the older ones from before the change but they often have damage and the plastic has yellowed. Apparently, you can bleach/dye it back with professional peroxide and a lot of sunlight. They can also be painted but ABS may not take paint well and it would be difficult with the shape, all the sanding, priming, etc. Add in that an old one can cost just as much, or more, as a new one and decided to go with a new one. Comes in a box encased in foam and wasn't broken and no painting! I decided to just call it a "variant" and leave it at that.
Fun to see them in Discovery!