Comment by hajile
I also owned a touchpad. You are misremembering if you think they look the same.
Here's a side-by-side image
https://i.insider.com/4e0cb173ccd1d561390e0000?width=900&for...
Here's a close-up detail of an ipad on top of a touchpad.
As I stated, you can clearly see sharp, flat edges on the ipad where it meets the back of the device while the Touchpad has a much more continuous rounded edge. In the side-by-side shots, you can also see how the Touchpad corners are much more rounded.
Here's some individual shots
Touchpad with side view
https://i0.wp.com/www.seriousinsights.net/wp-content/uploads...
https://images.anandtech.com/reviews/tablets/HP/TouchPad/_DS...
ipad with side view
https://images.anandtech.com/reviews/gadgets/iPad/introducti...
https://images.anandtech.com/reviews/gadgets/iPad/introducti...
I'm sure whatever differences you see seem important to you.
None of them prevented a $15 iPad case from working flawlessly with my TouchPad for a half dozen years.
Tapping into Apple's ecosystem in such a way is exactly the sort of action Apple dislikes, for obvious reasons.