Mesa firmware help needed 6i25_7i85s_7i78_7i73

Hello,
I am new to this, but anyway went ahead and bought a bunch of Mesa card to have something to play with.
I have wired them like this (picture below):
 

There is a firmware in the firmware .zip folder that looks similar to what I will be doing
" 5i25_7i85s_7i78.bit "

Are 5i25 and 6i25 firmware compatible ? I can't find 6i25 specific firmwares...
Should it be modified to get the 7i73 to work ?

Thanks in advance for your support

Yes, 5i25 firmware will work on a 6I25

And will the " 5i25_7i85s_7i78.bit " firmware support the 7i73 plugged in to the 7i85s ?

Yes, any sserial card can be connected to either the 7I85S or 7I78