LC9 vs LMG engine difference?

Can anyone tell me the difference between the two different 5.3?

Here is some info.
LH6
The LH6 with Active Fuel Management replaced the LM4 for 2005, and was the first of the Gen IV small block V8 truck engines to go into production. It is the aluminum block counterpart to the LY5.

LY5
Introduced in 2007, the LY5 Vortec 5300 is the replacement for the LM7 Generation III engine. For SUV applications, it is rated at 320 hp (239 kW) and 340 lb·ft (461 N·m) of torque; for pickup truck applications, it is rated at 315–320 hp (235–239 kW) at 5200 rpm and 335–340 lb·ft (454–461 N·m) at 4000 rpm

LMG
The LMG Vortec 5300 is the flex fuel version of the LY5. Power and torque ratings for SUV and pickup truck applications are the same as each application's LY5 rating.

LC9
The LC9 Vortec 5300 is the Flex-Fuel version of the LH6, and is found in 4WD models. SUV applications are rated at 310 hp (231 kW) and 345 lb·ft (468 N·m) of torque.
LC9 applications

i, personally, wouldnt worry or get too caught up in the engine code. they (5.3's) are all pretty much equal. plus gm is funny with changing engine code with small modifications.