How can I ignore insignificant change during merge ?

I need to merge a branch, +100k changes. The vast majority of changes are insignificant, because they only represent a screen position in the editor, so these changes should never have been in git - but but MadCap Flare already put them there.

The files in question are xml, and the difference can be exemplifed like this:

Original (when branches were created): html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="5" MadCap:lastHeight="32" MadCap:lastWidth="400" Branch1: html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="5" MadCap:lastHeight="24" MadCap:lastWidth="500" Branch2: html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="5" MadCap:lastHeight="41" MadCap:lastWidth="300"

How can git help me so files where the only difference matches something like this regex: /html xmlns:.* MadCap:lastHeight="\d+" MadCap:lastWidth="\d+"/

for the files that qualify, I want git to ignore the change, and therefore the merge-conflict, and then just accept "my" file for the merged changeset.

Any suggestions on how to I can have git help me with that ?

Best regards Jens Brejner