FWIW the Red Sox have a losing record (46-47) against teams with a record above .500 but a 13-4 record against the floundering National League East:
2024 MLB Standings and Records: Regular Season | MLB.com
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The official standings for Major League Baseball including division and league standings for regular season, wild card, and playoffs.
The Seattle Mariners have a 41-37 record against teams with a record above .500 but a 9-11 record against the daunting National League West.*
As three games separate the teams in the Wild Card standings, we'll never know what would have happened if the Red Sox had drawn the NL West in interleague play and the Mariners the NL East.
Good luck in the postseason.
* In defense of the AL East, its teams dominated AL West teams in the final two months to finish with an 82-79 record in head-to-head competition against their West opponents.