Yes indeed Real Madrid and Sevilla so far have the same opportunities. I think who is the most consistent in every La Liga game this season, he will win the title. This will be an interesting title race if the two of them play consistently. If so, maybe the title will be determined from their last match.
In theory, both Real Madrid and Sevilla have the same chance to win the title. But we don't know if there is a problem of players' injury on those teams, or one of them performs badly towards the end of the season. You are right that consistency will be the key to determining which team to win the La Liga title. Considering Real Madrid has more experience in dealing with the pressure of the title race, I favor Real Madrid to win. Maybe matchday 35 (Atletico vs Real Madrid) and matchday 37 (Atletico vs Sevilla) will be crucial matches to determine the winner.
Yeah I think the same ideas with you trough Sevilla left five points with Real Madrid but still has one match more, if success win from left one match they will reduce only three points with Real Madrid and make more competitive. Depend how Sevilla can playing well on left match because right now just possibility for La Liga trophy is Sevilla and Real Madrid, Barcelona and Atletico Madrid missing far points from Real Madrid each other left than 16 points, although have 18 match I think not easy for Barcelona and Atletico Madrid getting close points with Real Madrid or Sevilla, just take way how to get four top position only as possibility for both team.