Regions 7 and 8-AAAA (which include the teams you mentioned) have had such an agreement for as long as I can remember, and it is still in effect by mutual consent, but coaches can drop "sister" region matches by mutual consent in favor of scheduling regular season matches that better suit their needs. Next season will also be interesting with both regions going to only 5 teams each, with O-W moving out of Region 7 and Battery Creek moving to AAA from Region 8. I'm very curious to see how the pre-arranged schedules will look with these new numbers and how much leeway we will have to schedule regular-season matches with "non-traditional" opponents.