The shape of the body seems to be unique to this style of vase, together with the slighty raised rim. The oval shape doesn't seem to be used in the Inside Out vases.
The one on the right of the shots has a rough ground concave base, with the remnant of a pontil scar. The other has a polished concave base but a cruder finish to the rim. The maltese cross prunt on the right hand vase is made with glass the same blue as the body of the vase, The left one has a clear prunt.
Suzy xxx