Welcome to GH
LEDs are just wires with a glowing bit in the middle so you can certainly swap them, but there are two things to consider.
First - can you physically fit the white LED where the R/B one is? A picture would definitely help here, but I'm guessing they aren't actually in the switches as they have too many legs so this shouldn't be a problem.
Second - LEDs are connected to a resistor to limit the current. Different LEDs have different specifications so they need an appropriate value resistor. Generally speaking white LEDs and blue LEDs use a similar value but red ones use a bigger value, so you should connect the white LED where the blue one were.
If you have a multimeter you can measure what voltage and current is currently flowing before removing the old LEDs, if not buy a couple of spares and test with just one (or a couple, if required) - the worst you can do is burn the LED but I doubt this will happen.
The firmware may try to light up the "red" but if they aren't there it won't know, you'll just have to control the "blue" ones to actually change the settings.