No. Banks are regulated separately and more strenuously than securities firms, much less issuers. If Coinbase wants to offer Lend as an FDIC-insured deposit account, I’m sure the SEC would be fine with it. But Coinbase can’t do that because it doesn’t follow the rules banks must follow.
According to Coinbase, the SEC said "they consider Lend to involve a security." Not that it is a security. The second question is (a) more ambiguous and (b) a red herring from Coinbase.
If Coinbase is taking deposits from customers to engage in securities trading, it's acting as a bank or broker-dealer. It is registered and regulated as neither. Note that Kraken and Gemini have state banking charters. Coinbase is drawing a false equivalence. The entire enterprise stinks of bad faith, possibly fraud.