Q: Was there a chain swap or is blackcoin-more still on the original BLK chain?

A: There is still the original client, working and stable. More is the further development of Lore (no longer supported). More is still considered beta. The original client is preferred when you want stable stability, but it is slow with syncing to the network. Lore and More have implemented a few newer features from Bitcoin which makes it faster, especially when syncing to the blockchain. There is also payBLK which runs on node and can be used in a browser or mobile. PayBLK has an Iris variant which implements coloredcoins (tokenized assets) on Blackcoin blockchain.
All three however run on the same coin, and can send and receive BLK.