what colour were the stock LED's? If they were blue or green, their VF might be a little higher, and you can look into replacing the resistor. likewise, red LEDs are usually about 1.6V so you might have to change it there.
I notice the replacement LEDs have a VF of ~2V, so they might work as a drop-in
What's best is to check the resistor, and see what current you want through your new LED to see if it needs to be changed