I've used both the "old" and "new" versions of this film in 35mm and 120 and there is no practical difference in processing times. I've never changed my developing times from the old version, mainly because there were no published times for XTOL at 1+3 for the new version, and the results have been identical. So don't fret about it too much. Run a couple of tests to get things all nicely dialed in and you're set to go.