There is a simpler method yes.
1st go to system.def of the screenpack you like.
Locate the area where the versus screen is. Look for spriteno= (whatever number) everywhere in the versus screen section only.
Open up the system.sff and locate all those sprites and save them anywhere you want.
Now open up the system.sff file of the screenpack you want to use in fighter factory, usually just opening the system.def file and clciking the sprite section is easier.
Ok now simply add all those sprites to the screenpack.
Save it.
Now go to the system.def file that you originally liked the versus screen and copy the entire section text, based on versus screen only.
Then go to system.def file of the screenpack you want to use.
HIGHLIGHT THE EXACT SAME TEXT for the versus screen right click and paste. Basically overwriting it. And BAM your done.
(Keep in mind if you do have a sprite in that same group or same number already in your screenpack when adding the sprites you do like, just edit the spriteno in the versus section to a different number, very easily, and add those sprites to the group number you chose, there isnt that many depending on the versus screen you choose normally.) (Doing it this way you dont delete the previous on e and you can resort back at anytime as well.) OldGamer is a genius I will add.