Win32com excel find() output is not consistent when run in .py and in .exe

Question

When I run the code below, I get different results when I run in .py compared to when I run in .exe using pyinstaller

import win32com.client
import os

ConfigMacroName = "test.xls"
xl=win32com.client.Dispatch("Excel.Application")
Configmacrowb = xl.Workbooks.Open(os.getcwd()+ "\\Completed\\" + ConfigMacroName)
SlotPlansheet = Configmacrowb.Sheets("SlotPlan")
Header = SlotPlansheet.Rows(1)
SOcol = Header.Find('SO', LookAt=1).Column #I used LookAt=1 which is equivalent to LookAt:=xlWhole in excel VBA
SOlinecol = Header.Find('SO Line').Column
print("SO is " + str(SOcol) + "\nSo line is " + str(SOlinecol))

SlotPlansheet = None
Configmacrowb.Close(False)
Configmacrowb = None
xl.Quit()
xl = None

The excel input

The output in .py

The output in .exe

The output in .py file is the correct output I need. If I run it in .exe there will be duplicate variable since they both will refer to column B. For temporary solution I can just loop through the header to check each cell.

But I'm using find() function a lot so I don't know if my other programs are also affected by this inconsistency