Cell compare and highlight macro allowing user to select data ranges

Hi everyone. I have a macro (see below) that takes two code-defined worksheets from two workbooks and compares the data, colour highlighting any differences between cells in both worksheets.

However, what I would like to do is have this changed so that a popup window appears when the macro is run, prompting the user to select one range of data and then select a second set, then go on and have those selections compared. If this is not possible then perhaps the user could define which sheets/books are to be compared somehow (dropdown list, manually clicking?) rather than having to define them first in the code.

Any help much appreciated,

Nick, Cambridge, England

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