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The differences (and, these are all parts of the "penalty"):
1) After the at-bat is completed, illegal sub can be detected by the umpire or either team. BOO can only be detected by defense.
2) At the end of an inning, BOO can only be detected until the infielders have crossed the foul lines. Illegal sub can be detected until the first pitch of the next half-inning (rule on last inning is same as BOO).
3) The player for whom the illegal sub reported is out of the game (and can only reenter if he has reentry privelidges). The player who didn't bat in the BOO situation is not out of the game.
4) The penalty for illegal substitution includes ejection. The penalty for BOO doesn't.
You're reading way too much into this and making it more complicated than it needs to be, Greg.
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