Zip/Whisp-Pair-Doku: A Pair of Sudokus to Solve Together

Today's Puzzle:

A beautiful pair of puzzles that solve very smoothly together. How do you go about constructing such a thing?

Link to Play Along:

Zip-Pair-Doku by Dr Logic http://tinyurl.com/SudokuSleuthZipPairSuoku

Whisp-Pair-Doku by Dr Sudoku http://tinyurl.com/SudokuSleuthWhispPairDoku

Rules:

Zip-Pair-Doku:

Normal Sudoku Rules Apply.

Must be solved with 'Whisp-Pair-Doku'.

Normal Zipper Line Rules Apply - Digits an equal distance from the centre of a lavender zipper line must sum to the digit placed in the centre of the line.

X - Digits separated by an X sum to 10. Not all X's are given.

Whisp-Pair-Doku:

Normal Sudoku Rules Apply.

Must be solved in conjunction with "Dr Logics Zip-Pair-Doku" (Puzzles share a solution).

Adjacent digits along a green german whispers line must have a difference of at least 5.