I'm not sure how NA/EMEA challengers playoffs is going to happen if 2 teams ends with the same score.
I heard it might be head to head but I saw this league
https://www.vlr.gg/event/895/fgc-valorant-invitational-2022-act-1/group-stage
which did a tiebreaker match straight up.
Idk if anyone knows what it actually is but it would be sick to have a tiebreaker match!