I have a few pairs of Franco's figurines and some early and later Italian ones. The designs are very traditional and I could not pick Franco's designs from the older Venetian ones except that he now signs all his work. He didn't sign his work when he first left Caithness, so there are pieces of his work out there without signatures.
To me, your pieces do not look like Franco's work. Franco's ladies skirts usually have trailing and frills around the bottom, and they are not straight like yours. Also, he tends not to use aventurine, but to use gold coloured glass for the flecks.
I do hope that helps.