I know the Ig X La Bresse I saw last year just looked like White IG,
The colour of yours looks similar to a cross I did a few years back, Welsummer cock over LS hens, chicks were sex linked and laid very well, the hens were brown with black heckles.
I went on to cross Welsummer X Cukhoo Marans both from very dark laying strains, again the chicks were sex linked and there eggs were fantastic and lots more than either breed laid.