It may work, but there will be issues.
Cellular Carriers that support the Apple Watch, which models, the radio frequencies each model uses, and the country where they offer service:
https://www.apple.com/watch/cellular
Make sure the Apple Watch model you buy is the same as those supported by your carrier.
The warranty is country specific, so if you have warranty issues, you may have to return to Dubai.
Not all countries allow Facetime and require Apple to not enable Facetime on devices sold in their country, and Walkie-Talkie is a push-to-talk Facetime audio connection. If Walkie-Talkie is important to you, then make sure it is supported in the country where you purchase the Apple Watch:
Apple Watch Feature Availability
https://www.apple.com/watchos/feature-availability
ECG requires that the country where the Apple Watch was sold has given government approval for the ECG app And that the country where the ECG app is run has also approved the ECG app. If you do not have both, ECG will not function
Apple Watch Feature Availability
https://www.apple.com/watchos/feature-availability