The 1.5 M33 KExploit patcher makes 1.5 OFW be able to run kexploited homebrew. It does not change any keys. All keys should already be changed if you are running 1.5 OFW. The only point in changing keys is to be able to run the 1.5 OFW...
So why change keys again one inside of 1.5?
M33 does not have anything out to my knowledge that changes your IDStorage. They simply install CFW and maybe patch 1.5 to run kexploit..