Yes you can.
I have the patch from crofc.net with the Serbia,Croatia,Slovenia.. installed. I will convert the Region patch and install it too next week.
What i have done i to install the patch normally in my laptop. Them open it with CM and create a cmp for each league (in separate). Then install it with CM in the computer where i have my fifa. And it works.
And i play fifa 07 so i have much more work to do with conversions.
Of course for doing this you need to know very well what are you doing. I have to import teams and players first before you can import leagues and tournaments.
I had some problems with it myself in the begining but finally i managed to do it.
It´s not an easy task but it is possible.
For the guys that use CEP 08 and want to use fifa 08 kits you have to replace the m200.o and two other files i don´t remember (m232.o and m242.o i think) with fifa 08 ones.
Of course if you do that the fifa 07 kits won´t work anymore.
I have done this in my fifa07 and now i have fifa 08 kits in my game