Hive SBI predates Hive Engine. Traditional Hive SBI member units (what we are now calling voting units) are tracked internally in our database, but they can be viewed on our website or in the peakd wallet (or anywhere else that leverages our API).
The new HSBI tokens are an opt-in tokenization. It converts voting units into HSBI tokens. HSBI tokens are not eligible for upvotes and not convertible into voting units. The only current usefulness is tradability.
They are not the same thing.