As was said earlier, set Preamp Hardness to 9.5 and it will be IDENTICAL to 1.03 (except it won't thump when you change amp models). The polynomial is different but when set to 9.5 it equals the old polynomial at default value (intentionally for people like you).
Thanks for the tip! However on fw 1.03 I had preamp hardness at 5, can I match that with 1.04?? Does the loss of chime and top end crunchiness depend on this parameter as well? Thanks