Hi, I have an accord v6 2004 with 95k on the clock and need to add the coolant. The problem is the coolant inside my radiator is green but when I went to buy genuine Honda coolant the color is blue.

Questions:
1. Can I just buy Nulon green coolant and add it?
2. Flush and refill with the blue genuine Honda coolant now?
3. Wait until I change the timing belt and water pump which should be in another 6 months?
Thank you before.