5G is still in early days of support. Notwithstanding differences in the internal hardware and chipset, different devices (e.g., iPhone and iPad) will have different firmware-enabled features - and this will also vary by geographic region/country.
If you have any concerns, you would be best advised to seek assistance directly from Apple Support - as they will be nest placed to provide more detailed information where available. You can contact the Support Team using the Support link at top-right or bottom-left of this page.
Alternatively and perhaps easier, you can initiate and manage your support cases using the excellent Apple Support App. If not already installed on your iPad/iPhone, the App can be downloaded from the App Store:
https://apps.apple.com/app/apple-support/id1130498044