It's the same NPC ID, named differently, just like pets. There are only 40 IDs for them.
Code:
1 1 1 1 Apprentice Tank - Tier I
2 1 2 1 Apprentice Tank - Tier II
3 1 3 1 Apprentice Tank - Tier III
4 1 4 1 Apprentice Tank - Tier IV
5 1 5 1 Apprentice Tank - Tier V
6 2 1 1 Journeyman Tank - Tier I
7 2 2 1 Journeyman Tank - Tier II
8 2 3 1 Journeyman Tank - Tier III
9 2 4 1 Journeyman Tank - Tier IV
10 2 5 1 Journeyman Tank - Tier V
11 1 1 2 Apprentice Healer - Tier I
12 1 2 2 Apprentice Healer - Tier II
13 1 3 2 Apprentice Healer - Tier III
14 1 4 2 Apprentice Healer - Tier IV
15 1 5 2 Apprentice Healer - Tier V
16 2 1 2 Journeyman Healer - Tier I
17 2 2 2 Journeyman Healer - Tier II
18 2 3 2 Journeyman Healer - Tier III
19 2 4 2 Journeyman Healer - Tier IV
20 2 5 2 Journeyman Healer - Tier V
21 1 1 9 Apprentice Melee DPS - Tier I
22 1 2 9 Apprentice Melee DPS - Tier II
23 1 3 9 Apprentice Melee DPS - Tier III
24 1 4 9 Apprentice Melee DPS - Tier IV
25 1 5 9 Apprentice Melee DPS - Tier V
26 2 1 9 Journeyman Melee DPS - Tier I
27 2 2 9 Journeyman Melee DPS - Tier II
28 2 3 9 Journeyman Melee DPS - Tier III
29 2 4 9 Journeyman Melee DPS - Tier IV
30 2 5 9 Journeyman Melee DPS - Tier V
31 1 1 12 Apprentice Caster DPS - Tier I
32 1 2 12 Apprentice Caster DPS - Tier II
33 1 3 12 Apprentice Caster DPS - Tier III
34 1 4 12 Apprentice Caster DPS - Tier IV
35 1 5 12 Apprentice Caster DPS - Tier V
36 2 1 12 Journeyman Caster DPS - Tier I
37 2 2 12 Journeyman Caster DPS - Tier II
38 2 3 12 Journeyman Caster DPS - Tier III
39 2 4 12 Journeyman Caster DPS - Tier IV
40 2 5 12 Journeyman Caster DPS - Tier V