@ranochigo: Thanks. This information is very useful.
Can I copy over the entire Bitcoin data directory from Bitcoin Core to Bitcoin ABC wallet and not just specific files from it? There are a lot of dat files inside the data directory and I'm assuming that they should be valid for Bitcoin ABC wallet as well?
Yes. If you remove any of the files, the blockchain will be corrupted and you will have to download it again. Just asking, did you prune it?