HAPPY.2DA - BG:EE vs BG2:EE

I noticed that the HAPPY.2DA file is different between BG:EE and BG2:EE.

1. In BG:EE, happiness scores have small +/-1 increments between scores in the same general categories (e.g., for Good characters, happiness is 80 at 13 rep, 81 at 14, 82 at 15, etc..). In BG2:EE, there is only the major increments in happiness (e.g., 80, 0, etc..) with no +/-1 increments.

2. In BG:EE, neutral characters are happy at reps > 15 and neutral from 6-15. In BG2:EE, they are happy at reps 13-15 and neutral from 6-12 and above 15.

Does anybody know why the changes were made? Does the lack of +/-1 incrementing affect NPC reactions?

BG1EE HAPPY.2DA (rep >= 10):
[spoiler]
GOOD NEUTRAL EVIL
10 0 0 0
11 1 0 -1
12 2 0 -2
13 80 0 -80
14 81 0 -81
15 82 0 -82
16 83 80 -160
17 84 81 -161
18 85 82 -162
19 86 83 -300
20 87 84 -301
[/spoiler]

BG2EE HAPPY.2DA (rep >= 10):
[spoiler]
GOOD NEUTRAL EVIL
10 0 0 0
11 0 0 0
12 0 0 0
13 80 80 -80
14 80 80 -80
15 80 80 -80
16 80 0 -160
17 80 0 -160
18 80 0 -160
19 80 0 -300
20 80 0 -300
[/spoiler]