Ooerr, TC, they do look the same don't they - they have such lovely faces.
Adrian, when you say yours have all the look of being old, can you tell us what you're seeing please? Repros have been made for many years, a great number of them dating from the 1920s/1930s so they'd still look old, but not as old as the old, old ones if you get my meaning.
Is there crazing in the glaze? Is is dark and even or is it variable in colour and density?
The fact that yours are marked worries me as none of the early Staffordshire dog makers marked theirs, (but makers such as Bow and Derby who made similar items did mark them.)