Hey calm down
There are Me7.5 with 2 of these maps. If the Car has VVT then they are used both.
One of the VVT is 22° and the other if VVT is at 0°. Thats it.
I cant tell you why there are four. If i remember MED9 has even more then 4.
If you do changes to the timing then make all of your 4 maps look the same. Thats it!