Excel 2010 :: VBA Routine To Perform Text Diff

I am looking to implement the "Compare Documents" function (available in Word 2010) in Excel 2010 through VBA programming between different text contained in two cells.

In Word this function works quite well (not perfectly), but it highlights in different ways which part has been deleted and which one has been added between an "original" document and a "revised" one.

For the nature of my job, I need to do this on a daily basis and I used to output text from Excel to Word, then compare the two text, and then copy it back to Excel.

Here comes the problem: since in Word the text is formatted (and what I'm looking for is formatted/highlighted text as output), I can't just paste it in Excel as it is: any editing, merging, splitting done on the pasted text (that eventually I need to do) makes the formatting disappear (above all with VBA functions, that can only output data and can't format it).

In other words: given two cells containing different text, I would like to be able to fill a third cell with text formatted accordingly to the TextDiff output between the two original cell.

E.g.:
INPUT:
Cells(1,1).Value2 = "my name is Andrea and I like jogging" (original)
Cells(1,2).Value2 = "my name is Giovanni and I like running" (revised)

OUTPUT:
Cells(1,3) wll contain: "my name is AndreaGiovanni and I like joggingrunning"

Obviously, since UDF doesn't allow formatting of cells, I would need to adjust the main Sub for each pair of document I have to revise, but that won't be the problem: what I need is the engine. It's been two years and a half that I do advanced VBA programming at work but it looks like I can't grasp the rationale behind the LCS algorithm.