The difference is how much one emits to steer the missile. Mid course update is meant to be stealthy. Command guidance is typically meant one way communication. Data links implies two way communications, but not always using RF energy.
IIRC, the IR variants are LOBL, while the radar variants do not use command guidance (no air to air missiles use this but the earliest ones, unless you’re referring to the mid-course updates, but these missiles have no datalink), but the lock-on is delayed till after launch to avoid interference caused by the main radar’s sidelobes to the missile’s seeker.
Ljozic, not sure what you are trying to say. IR missiles can be launched blind, with the seeker slaved to where the radar expects the target to be. The problem is the seeker may not track the intended target. And you realize semi active and active radar homing seekers operate completely different. The missile seeker on SARH has to be locked on before launch to be effective. The seeker on ARH requires mid course updates near its apex or it will have a tiny chance of interception.
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