Quark does borrow hashing functions from SIC, but has significant differences:

1. Instead of 6 rounds of hashing, 9 rounds of hashing, with 3 of the rounds applying a random hash algorithm.
2. Different difficulty adjustment algorithm.
3. Different reward calculation algorithm.
4. Quark supports transaction comments (similar to Florin). This functionality will be exposed in the UI and RPC interface in a future release.