Does anyone know the difference between
1) "Triton Engine; Ford Engine; 16 Valve Eng.; MFI; SFI Fuel System; SOHC; Block Cast # 2L1E-6015-A3C; Crank Cast # F75E-A17E; Left Head Cast # 2L1E-6090-C20B; Right Head Cast # 2L1E-6090-C20B; No Oil Pan, PI Heads; T/C Installed Cast #2L3E-6C086-BA; SEN; 249"
and
2) "Triton Engine; Ford Engine; 16 Valve Eng.; MFI; SFI Fuel System; SOHC; Block Cast # 2L1E-6015-AD; Crank Cast # F75E-6303-AE; Left Head Cast # 2L1E-6090-DA, PI; Right Head Cast # 2L1E-6090-DA, PI; TIMING COVER AND OIL PAN INSTALLED; SEN; 249


I'm looking into a reman engine and ATK/Spartan lists 2 for a 2002 F250 SD