You can easily charge the 33-watt mobile with the 67-watt charger from the Redmi 12 without damaging it. The smartphone only draws as much power as it supports and regulates the charging power itself accordingly to prevent overloading. A charger with a higher wattage is therefore unproblematic and can even charge faster if the mobile supports it. It is important that the charger supports compatible fast charging protocols such as Power Delivery or Quick Charge, which is usually the case with Xiaomi chargers.