They should work for all devices, the base OS is updated to 7.8 from one cab then languages, then device specifics.
Sent from my SGH-i937 using Board Express
I advise to wait for the update that is specifically for your model. The 7.8 update will contain OS updates, but for Nokia devices (and probably also the other brands) there will also be a model-specific OEM-update. That update is necessary to let the 7.8 OS update run smooth on your device. The OEM-updates won't update on different models. And if you only flash the OS-update, it will work, but you will notice lag on the startmenu. And you will obviously miss some of the new features, like the new bluetooth-stack.
- Heathcliff74 -