10
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Solve the Sudoku on the left, where the usual rules apply.

The dots outside the board on the right indicate how many cells in the corresponding column or row of that board contain precisely the same digit as is to be found in the same cell of the solved Sudoku on the left.

enter image description here

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Here is the answer; blue is the same, orange is different:

Here's a gif of how I solved the puzzle, in reverse (using this site, hosted via Giphy); green is used to designate a pair where one will be orange and the other will be blue:

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Nice puzzle!

Here's my go at it:

enter image description here

I started by marking all the known data to the right hand square, then solved it using sudoku rules (out of three 4s in a column, at least two must be wrong, etc), and ended up with this easyish sudoku:

enter image description here

A more complete write-up coming up as soon as I have the time.

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