[Python] Changing tkinter elements from other files in python

I am trying to change tkinter elements from other python processes (in seperate files). Is it possible to do so without restarting the start.py GUI window from end.py due to the import start in my minimal reproducible example?

start.py:

import tkinter as tk
import sys
import subprocess

root = tk.Tk()
root.geometry("350x350")

button = tk.Button(root, text="Open end-Window")
label = tk.Label(root, text="Start Label", font="Helvetica 20 bold")
button.pack()
label.pack()

def start_endWindow() -> None:
subprocess.Popen(
[sys.executable,"end.py"],
creationflags=subprocess.CREATE_NO_WINDOW
)
button.configure(command=start_endWindow)

if __name__ == "__main__":
root.mainloop()


end.py:

import tkinter as tk
import os
import start

root = tk.Tk()
root.geometry("350x350")

button_end = tk.Button(root, text="Change color in start-window")
button_end.pack()

def change_label_in_start() -> None:
start.label.config(fg="red")

button_end.configure(command=change_label_in_start)

root.mainloop()




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