Yes, they are technically Region B, but just like with Region 2 DVD, there are difference between releases from different countries within that "region."
In the case of a lot of BDs from Eastern Europe (the "CEE" labeled ones) those are from different masters than the "EU" (European Union) BDs from places like the UK, France, Italy, or Germany. The CEE Bds are from countries like Poland, Czech Republic, Hungry, or Turkey.
Most places that tag their releases will not label just "Region B" (or other region, as this applies to BDs worldwide) as the origin of the material, as that's not specific enough, which is why I have seen the following tags used:
- GBR or UK - obviously a British BD release
- US - duh
- CAN - duh, Canada
- GER or DE - for German releases
- FR - for French releases
- CEE - Central or Eastern Europe - countries like Poland, Czech Republic, Slovakia, Hungry, Romania, Turkey
- JPN - for Japaneses Releases
- ITA - for Italian releases
- RUS - for Russian releases
- AUS - for Australian releases
- CHINESE - well, that one is obvious, LOL
These are tags that I have seen myself, where some film was determined to have the "best" release on BDs originating from somewhere on the above mentioned list.
Hope this helps