Not really. Where there is a second number please just imagine the underline is a crossing out as they have been used. It also helps know which players are on field should it go to penalties.
Subs
12 6
14 8
15 12
16 9 11
17
So 6 was replaced by 12, 8 by 14, 12 by 15, 9 by 16 and 11 by 9...