Just for clarity, what you said is not entirely true. Vive Pro has new improvements across the board. The only thing that is the same from what I can gather are the lenses but nobody has talked about them much. Also, The original vive did incremental updates during its life cycle. They made it lighter etc.
- New headstrap (more ergonomic)
- New 2nd camera (depth cameras)
- New headphones
- New microphones (dual noise canceling)
- New colour
- New wireless module
- New tracking support (Lighthouse 2)
- New controllers (with support for Lighthouse 2)
- New cable management (Tetherd by single, lighter longer cable)