df8.cbind(df9)

#     A      B      C      D     A0    B0    C0    D0
# ----- ------ ------ ------ ------ ----- ----- -----
# -0.09  0.944  0.160  0.271 -0.351  1.66 -2.32 -0.86
# -0.95  0.669  0.664  1.535 -0.633 -1.78  0.32  1.27
#  0.17  0.657  0.970 -0.419 -1.413 -0.51  0.64 -1.25
#  0.58 -0.516 -1.598 -1.346  0.711  1.09  0.05  0.63 
#  1.04 -0.281 -0.411  0.959 -0.009 -0.47  0.41 -0.52
#  0.49  0.170  0.124 -0.170 -0.722 -0.79 -0.91 -2.09
#  1.42 -0.409 -0.525  2.155 -0.841 -0.19  0.13  0.63
#  0.94  1.192 -1.075  0.017  0.167  0.54  0.52  1.42
# -0.53  0.777 -1.090 -2.237 -0.693  0.24 -0.56  1.45
#  0.34 -0.456 -1.220 -0.456 -0.315  1.10  1.38 -0.05
# 
# [100 rows x 8 columns]
[]