I'm not aware of any ready-made websites for it, but if you get a copy of the SBL Greek NT, it has an apparatus listing differences between it and the UBS (as NA or NIV), the Robinson-Pierpont (RP) and Westcott-Hort (WH). I don't think it lists differences with the TR, and I don't know any place that list differences with the 1904 Patriarchal text. That one just isn't on the scholarly radar screen, but it should be very similar to the TR or RP.
Stephen C. Carlson, Ph.D. (Duke)
Post-Doctoral Fellow, Faculty of Theology, Uppsala