[Python] How can a tkinter button dynamical control the content of other buttons?

I try to create some buttons and the content (picture) of these buttons is controlled by another button, dynamically.

E.g.

Button A and Button B are controlled by Button C and D.

If I press C, then A is 'Pic1' and B is 'Pic2' and if I press button D then A is 'Pic3' and B is 'Pic4' and also back to A is 'Pic1' and B is 'Pic2' if I press Button C again.

I already tried to code the button explicitly like this:

def my_command(value):
print (value)
return

button= Button(win, image=tes[0],command= lambda: my_command(1),borderwidth=0)
button.grid(row=0,column=0)
button= Button(win, image=tes[1],command= lambda: my_command(2),borderwidth=0)
button.grid(row=0,column=1)


This one works fine pressed 1 my_command(1) returns Button:1 if pressed 2 my_command(2) returns Button:2)

BUT when I put it in a for-loop like this:

j=0
for i in f1:
# file up a list of pic from files, f1 is a list of valid file names
click_btn1= PhotoImage(file=i)
tes.append(click_btn1)
#set the image of the button
img_label= Label(image=tes[j])
# assign button and command
button= Button(win, image=tes[j],command= lambda j=j:
my_command(j),borderwidth=0)
button.grid(row=0,column=j)
j +=1


The buttons are displayed and I can click them but my_command(j) returns "Button:2" all the time, no matter which button I press (1 or 2)

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