angles and coordinate systems

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just found ahrs, very nice documentation! I always test a few basics first to understand the assumptions such as used coordinate system:

import numpy as np
from ahrs import RAD2DEG
from ahrs.common.orientation import acc2q, q2euler

acc_raw = np.array([1000, -2500, -7600])
q = acc2q(acc_raw)
euler_degree = acc2q(np.array(acc_raw), return_euler=True)
euler_from_quaternion_degree = q2euler(q) * RAD2DEG
print('euler_degree', euler_degree)
print('euler_from_quaternion_degree', euler_from_quaternion_degree)

prints

euler_degree [-161.79151553 -7.12446549 0. ]
euler_from_quaternion_degree [161.65928442 -6.76600121 2.23662995]

any reason for different angles?