可唔可以同時有大陸和香港永久居民身份証?

good ANS.

If you hold a Mainland ID Card, you status in Mainland China is Mainland resident only. The Mainland China government will not consider you as a Hong Kong resident. You cannot get any help from HK government when you're in Mainland. You cannot use 回乡证 anymore. 回乡证 is for HK/Macau residents only.

However, it is legal to hold both HK and Macau ID cards at the same time.