As per the current T&C of Kiwi Yes Bank Credit Card, you cannot apply to the same if you hold another Yes Bank Credit Card. Be it 60 days or 90 days, even if you apply then, again it will be rejected. Better to talk to KIWI customer care and get guidance, if they're rolling out the credit cards for existing Yes Bank users sometime in future. Otherwise, you'll be only hitting your CIBIL and Experian without the card approval.