Due to the way Cassandra and Scylla works, the SSTables contain a specific token range and each node is responsible for a part of the token range. sstable copy

Due to the way Cassandra and Scylla works, the SSTables contain a specific token range and each node is responsible for a part of the token range. sstable copying is possible, but the two clusters must have the exact same topology, with the exact number of nodes, and each node pre-configured to have the exact same tokens in their ownership. That's rarely the case in practice. When it is, we always recommend copying SSTables.