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Here are the result of some preliminary experiments I've done:

bishops in aancas white:1.5
bishops in griffins black:4.5
1 draws (draws enter in the points above)

knights in aancas white:4
knights in griffins black:2
0 draws (draws enter in the points above)

bishops in griffins white:5
bishops in aanca black:1
0 draws (draws enter in the points above)

knights in griffins white:2.5
knights in aancas black:3.5
1 draws (draws enter in the points above)

total:
games 24 from which draws:2
aancas poins:10
griffins points:14

[edit:]

Here I pited an army with 2 aancas against an army with 2 griffins.

the promotion rule was rook at 8 rank.