XV Sudoku Puzzle (Fun With Sudoku #262)

I am always looking for feedback to improve this website. This feedback can be anything from layout to any broken puzzle. It will help me to improve this website. Yesterday, I received feedback from one of the readers that the Sudoku puzzle titled XV Sudoku Puzzles (Fun With Sudoku #240) does not match the answer provided. However, if I can the given digit from 7 to 8 then it matches with the given solution. However, the puzzle was unique and can be solved with the given hint 7 without changing anything in the given XV patterns. 
This leads me to discover a few things for the XV Sudoku puzzle. Numbers 1,4,9,6 and 2,3,7,8 are related to each other respectively. It means that one can exchange 1 and 4 & 9 and 6 without changing anything in the given XV pattern. A similar one can exchange 2, 3 and 8, 7 without changing anything in the given pattern. To prove this fact, I have created today's XV Sudoku puzzle.
Today's puzzle is the remake of XV Sudoku Puzzles (Fun With Sudoku #240) in which 8 in that puzzle is changed with 7, leading to a change in the solution string completely. In the solution string, all 7 gets changed to 8 and all the 2 gets changed to 3, and vice versa. However the solving path, pattern to XV remains the same. Just try to solve these two puzzles independently to understand them better :).
I am posting this XV Sudoku puzzle in the Fun With Sudoku Series as the 262nd Sudoku puzzle in this series.

Rules of XV Sudoku Puzzles

Below is the solution to XV Sudoku puzzle, which is published with the title XV Sudoku Puzzle (Daily Sudoku League #207)
XV Sudoku (Daily Sudoku League #207) Puzzle Solution
XV Sudoku (Daily Sudoku League #207) Puzzle Solution

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