you have to compare the files with winmerge which is a great program that shows you differences in the files.

you can do it in 2 ways, compare the new templates directly with your templates and copy what ever changes you want across. this is fastest but if you have changed a lot of the templates the amount of differences will be too much and too hard to compare.

so the second way i do it is compare the old original template with the new original template and then copy the changes to your own template.