Can I have one account as IBKR Lite and one account as IBKR Pro with IBKR Singapore?

No, all users/accounts owned by a client will need to be either IBKR Lite or IBKR Pro.

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Can I have one account as IBKR Lite and one account as IBKR Pro?
Does IBKR Lite have the same account protection as IBKR Pro?
How can I tell if I have an IBKR Lite or IBKR Pro account with IBKR Singapore?
Can introducing brokers have both IBKR Lite and Pro clients?