Edge 800 rear case - difference in old vs new version

My Garmin Edge 800 power button has broken so I need to buy a replacement case, but I can see there are 2 versions - 

https://ae01.alicdn.com/kf/H9e5f537d546f4842a552446710da78d1b/Yqwsyxl-Original-Back-Case-for-Garmin-Edge-800-bicycle-speed-meter-Back-Case-Without-Battery-Repair.jpg_.webp

Mine is version 2 - but how does the internal elements differ?  Can I fit a Version 1 back to a Version 2 device?  

This picture shows (in theory) the 2 internals, but I can't see any difference (poor photo).

https://ae01.alicdn.com/kf/H343eb8cad44843a28a39f047379b2b63B/Back-cover-case-for-garmin-edge-800-button-repair-broken-replacement-waterproof-no-battery.png_.webp 

Does anyone know if a Version 1 case can be fitted to a Version 2 device?

Thanks!