Europe didn't assign 3.8-3.98GHz band to 5G - outside of limited deployments in UK, the allocation stops at 3.8GHz and the next band starts way further than 200MHz away from end of aviation bands.
The initial deployment of C-Band in the US is from 3.7 to 3.8 GHz leaving a nearly 400 MHz guard band. Anything above 3.8 GHz won't be deployed for nearly two years, after the incumbent satellite operators clear the spectrum.