I chose flight DL1298 from LAX-KOA 10/16 because I could get exit row seats with my Delta Silver. But now Seatguru is showing row 21 as standard seats, not exit row. The Delta map shows it as exit row. Anybody know how I can find out for sure? Which is usually more accurate?

Plane is a Boeing 737-900ER. Delta shows 5 rows of main cabin before 3 exit rows, 19, 20 and 21. Seatguru shows 4 rows of main cabin before 2 exit rows, so 19 and 20 are the exit rows.
https://www.seatguru.com/airlines/De...tno=1298&date=