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how to return last condition if other 2 not met?

i want to check/return for 3 conditions, it loops shortest str and finds diff in other
1. if difference is immediate before end of range, return index, exit
2. if string length is same and index loop is done, return 'identical'
3. if neither of above is found. it means the short loop ended and every letter was same so next letter of longer str is the diff, just return idex+1
but my last print statement always print. not sure how to end this

str1= "kitti cat"
str2= 'kitti catt'
lenStr1= len(str1)
lenStr2= len(str2)

#find shortest str and loop range with this one
if lenStr1 >= lenStr2:
    str= str2
    str= str1
# loop each character of shortest string, compare to same index of longer string
# if any difference, exit and return index of difference
for idx in range(len(str)):
    a= str1[idx]
    b= str2[idx]
    if a != b:      #immeditely exit, since non-match found
       if len(str1) == len(str2) and idx == len(str1)-1: #if no difference print 'identical'