Wilson Audio Resistors

I am grateful for your answers, I am aware of the differences but the sensitivity increase with the proposed change is only 0.25 db/watt at 1 meter distance.
Anyway, I want to make sure that this procedure does not alter the useful life of the resistors and why not say it, of the speakers too.
All your comments will be to my liking and of great help.

Make sure you take wattage into account here. You may get the right total resistance, but the wattage requirements for each may be different. Being in the tweeter this probably won’t be a huge deal, but still.

Also, honestly, you are MUCH better off doing room treatment or using a DSP than attempting to do this in the crossover. Changing a tweeter crossover resistor is never going to give you the fine grained control over your balance problems that you need.

Consider equalizing by using wall mounted diffusors on one side and stand alone diffussors on the other.  Alternatly, put the speakers in a corner instead of flat against the wall.

It looks like it's possible. From the manual:

Section 3.4—Resistors Midrange and Tweeter Resistors By removing the large aluminum back cover on the rear of the woofer module of your Sasha DAWs, you may gain access to the resistor plate. These resistors serve several functions. Note: Only Wilson Audio replacement resistors should be used in your Sasha DAWs. Changing the value or brand of resistor will have a deleterious affect on the sonic performance of your loudspeakers and will void your Wilson Audio Warranty. The Tweeter Level, which consists of two 6.0 ohm resistors in parallel, and Midrange Level, which consists of two 4.8 ohm resistors in parallel, resistors provide precise level matching for the midrange and tweeter drivers correspondingly. The resistors also act as ultra high quality fuses which open before a driver can be damaged by excess power. Additionally, these resistors can be used to tailor the output of the corresponding driver to overcome tonal balance issues that result from room acoustics.