Its absoluelty fine to stay the same and play a mirror formation match!, you will have to watch the game stats very closely to see who is winning the key areas ( Tackling, shots, possession) and alter to suit!, you could try 4-3w-3 and see if it pegs him back, or be more conservative a nd play a back 4 so 4-1-3w-3 would be a good start base!, if you do come across this which I have only on a handfull of occassions then set attacking to normal, no forced counter attacks at the start then change later on say HT!, changing to MOM marking is worth a try! I have never used it in that situation I like zonal to much as MOM I think also drains players energy following his opponent but that just me thinking in my head I dont know for sure if it has any effect.