Although I think it's pretty common that the SEC teams have stronger strength-of-schedules than the Big Ten teams.
Here's last season's s-o-s rankings from Sagarin:
Georgia: 12
Alabama: 20
Tennessee: 27
LSU: 10
Ohio State: 29
Michigan: 52
Penn State: 43
Iowa 32
Here are the Sagarin ranking for Alabama’s and tOSU’s 2022 opponents:
Team 1: 116, 8, 142, 95, 29, 39, 4, 19, 10, 30, 151, 45
Team 2: 17, 146, 79, 31, 114, 54, 21, 6, 103, 86, 37, 5
Team 1 average: 57.33
Team 2 average: 58.25
Team 1 played 3 teams in top ten: 8, 4, 10
Team 2 played 2 teams in top ten: 6, 5
Team 1 played 3 teams above 100: 116, 142 and 151 (another at 95)
Team 2 played 3 teams above 100: 146, 114 and 103 (next one at 86)
Team 1’s Std Dev … 53.8 (difference in caliber of opponents)
Team 2’s Std Dev … 46.6
SOS is determined, by who you play (and beat) and who your opponents played (and beat). The SEC doesn’t lose non-conference games so that inflates their SOS even if their opponents aren’t great. Then they beat up on each other.
Team 1 is Alabama and they had a #2 Sagarin rating overall. Team 2 is tOSU and they had a #3.