Here is the complete rule again with all exceptions. It calls out Live Ball fouls with Dead Ball fouls and the like in the exceptions. In Exception 1, it only states 15-yard penalties vs. 5-yard penalties. There can be Live Ball (Roughing the Passer) or Dead Ball (Personal Foul) Fouls that are 15 yard penalties. So if Live Ball / Dead Ball are mentioned by name in later Exception scenarios, then it is all-inclusive where you only mention yardage in this Exception, right? I mean, it's just logical.
RULE 14
SECTION 5 FOULS BY BOTH TEAMS (DOUBLE FOULS)
ARTICLE 1. DOUBLE FOUL WITHOUT CHANGE OF POSSESSION. If there is a Double Foul (3-14-1-e) during a down in which
there is not a change of possession, the penalties are offset, and the down is replayed at the previous spot. If it is a scrimmage
down, the number of the next down and the line to gain is the same as for the down in which the fouls occurred.
Exceptions:
(1) If one or more fouls by one team includes a 15-yard penalty, and the penalty for the foul or fouls committed by the other
team is for a five-yard penalty without an automatic First Down, a loss of down, or a 10-second runoff (15 yards versus
five yards), or that is not a spot foul, the 15-yard penalty is enforced from the previous spot, and the five-yard penalty is
disregarded. Five vs. 15 enforcement cannot be declined by the team that committed the minor foul, except as described
in (2) below. See 4-8-2-h and 14-4-9-Item 3-Exc. 1 for dead ball fouls at the end of a half.
(2) If one of the fouls is a Dead Ball Foul for delay of game for spiking the ball and the opponent’s foul is a Live Ball Foul,
the team that committed the delay of game foul, in addition to Article 1 above, will have the option to decline the foul
committed by its opponent and be assessed the penalty for delay from the dead-ball spot.
(3) If both fouls are Dead Ball Fouls or are treated as such (14-4-9), the penalties are offset, and the ball is next put in play
at the succeeding spot, unless the Dead Ball fouls occur after the ball has been made ready for play, in which case 5 vs.
15 enforcement applies.