These patches are unofficial. The ones that apply do work. The ones that don't apply may just need a new offset. So if any of the patches you want to apply don't work, take note and post which ones so others can take a look to see if it's just needs a new offset.
I know most of the patches work for 4.38.23171.
I don't know how many work for 4.39.22861 or will work for 4.41.23145.
Go here to get the firmware ZIP file you need for the patches.
https://pgaskin.net/KoboStuff/kobofirmware.html