What is the difference between two matrices?

Recently I got a script from GitHub which provides user an opportunity to select several ROIs in an image of color checker. Then the script computes a correction matrix 3x4 (cc_mat) where first three columns contain RGB coefficients and the last one contains coefficients to keep proper white balance:

[[ 1.85740626e+00 -3.61503768e-01 -3.23657397e-01 -1.76378977e+02]
 [-3.87633414e-01  2.09003773e+00 -5.27259304e-01 -1.79348491e+02]
 [ 8.14513011e-02 -1.07566732e+00  2.13731634e+00 -1.46534728e+02]] 

My goal is to adjust this code the way it would change the image according to the matrix. I googled how to change color channels of an image and there was such a recommendation (How to Access and Change Color Channels using PIL?):

from PIL import Image 

# Open image 
im = Image.open('image.jpg') 

# Make transform matrix, to multiply R by 1.1, G by 0.9 and leave B unchanged
# newRed   = 1.1*oldRed  +  0*oldGreen    +  0*oldBlue  + constant
# newGreen = 0*oldRed    +  0.9*OldGreen  +  0*OldBlue  + constant
# newBlue  = 0*oldRed    +  0*OldGreen    +  1*OldBlue  + constant
Matrix = ( 1.1,   0,  0, 0, 
           0,   0.9,  0, 0, 
           0,     0,  1, 0) 

# Apply transform and save 
im = im.convert("RGB", Matrix) 
im.save('result.png') 

First I gave this script a try by inserting input values instead of 1.1, 0.9 and 1. It worked OK.

r_chmult = float( input( 'Multiply Red channel by \n' ))
g_chmult = float( input( 'Multiply Green channel by \n' ))
b_chmult = float( input( 'Multiply Blue channel by \n' ))
img2 = im.open ('D:/Python/Checker.jpg')
Matrix = [r_chmult, 0, 0, 0,
          0, g_chmult, 0, 0,
          0, 0, b_chmult, 0]
img3 = img2.convert( "RGB", Matrix )
img3.save( 'D:/Python/result.jpg' )
img3.show()

Then I tried to put cc_mat in place of Matrix in im = im.convert("RGB", Matrix). This time it didn't work and the error said:

Traceback (most recent call last):
  File "C:/Users/studi/PycharmProjects/pythonProject/venv/Checker.py", line 144, in <module>
    img3 = img2.convert( "RGB", cc_mat )
  File "C:\Users\studi\PycharmProjects\pythonProject\venv\lib\site-packages\PIL\Image.py", line 912, in convert
    if not mode or (mode == self.mode and not matrix):
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

What's my problem? What is the difference between these two matrices?