Are there huge differences between the S4 (1992-1994) and the S6 (1995-1995.5/96) front bumpers? In other words, will an S6 front bumper fit on an S4 or visa versa? The P/N for the S4 bumper assembly is 4A0 807 101 E and the S6 is 4A0 807 101 FJ. Thanks, Jim