Sum or Difference Sudoku (Fun With Sudoku #136)

The Sum or Difference Sudoku type appeared in the recently held 10th World Sudoku Championship and I created two puzzles of this type to get the practice Sum or Difference Sudoku type. 1st puzzle, I have already posted with the title Sum or Difference Sudoku (Daily Sudoku League #140). This is the second Sudoku that I rate better than the previous one. In this Sudoku all the outside given sums or differences I have kept in such a way that for many of the hints, it is very difficult to guess whether it is a sum of different numbers. Hope you will like this Sudoku as much as I loved creating this one.

This Sum or Difference Sudoku, I am posting as the 136th Sudoku in the Fun With Sudoku Series. Can you solve this Sudoku puzzle variation?

Rules of Sum or Difference Sudoku

Standard Classic Sudoku Rules apply. Additionally, the clue outside the grid indicates either the sum or difference of the two nearest digits in the corresponding column or row.