Bl**dy predictive text makes (that's an 8 followed by a closed bracket) into a smiley !!!B**ger me, there it goes again !!
According to the math in the previous response 390 ohms would be a 4.4% increase... 470/408 = 1.15 or a 15% decrease in current. It is my not so humble opinion that the 390 ohm resistor would be a better choice as it would increase the current by 1.1 mA, the 470 ohm resistor would decrease the current by 3.75 mA...Doc
One cannot determine exactly how much more since the LED is a non-linear device. So one would select the more conservative 470 ohm. This would mean less current flowing so the LED would be somewhat (slightly) dimmer.