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(via Boltzman of BEMIL)
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This is Chun-goong block 1 effector side thruster design. As you've guessed, it's a SIE similar to PAC-3 side thrusters and is used for both missile attitude control after launch and during terminal phase.
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Chun-goong block 2 has two separate side thrusters, of which the terminal phase side thruster being what ADD calls a "Nozzle Closure Separation Device". Post-launch ACS is very similar to what was already being used in block 1. The new DCS is more similar to 9M96 in terms of how it is structured internally.
So overall, quite a difference for the side thruster designs for both the block 1 and block 2 effectors.
Chun-goong uses kinetic energy rod warhead, whereas to my knowledge, 9M96 variants doesn't.
I don't know what the original source material that you have translated is, but that is false info. L-SAM AAM will have its DCS side thruster placed just in front of the main propellant behind the guidance section. What it doesn't have is the post-launch ACS, since it is hot-launched unlike Chungung