A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 102,617
Seatguru is known to be outdated and inaccurate. I would trust the DL seat maps, but be aware that aircraft substitutions are possible.
You could try calling DL to verify that you have exit row seats.