import xml.etree.ElementTree as ET
import difflib
import sys
import pathlib

def canon(path):
    tree = ET.parse(path)
    root = tree.getroot()
    for elem in root.iter():
        elem.attrib.pop('ExportDate', None)
        # sort attributes
        if elem.attrib:
            items = sorted(elem.attrib.items())
            elem.attrib.clear()
            elem.attrib.update(items)
    return ET.tostring(root, encoding='unicode').splitlines()

a = canon(sys.argv[1])
b = canon(sys.argv[2])
for l in difflib.unified_diff(a,b, lineterm=''):
    print(l)