Differences between keltic nordid and noric:
First,the slope of the forehead - at keltic nordid,the forehead is not straight,but has a slope.
Second - the vault - keltic nordids have a low vault.
The vault is the distance from the eye till where the forehead starts,that is taken on horizontal.
So more prominent forehead - higher vaulted.
Dinarids are quite decent vaulted.
Third - the bones,are easy see and to make difference - keltic nordids are soft boned,while norics are at least medium boned.
Check this keltic nordid,how low vaulted he is.
Also,usually the height of the forehead at norics is very high while at keltic nordids is maximum medium.