Intriguing! I think they are the same...very similar hairstyle with the remnants of the 1860s ringlets but the second photo is a bit later. Typical 1870s pose and fringed chair. Again, no wedding ring, but this lady is wearing a wooden love chain carved from a single piece of wood.
This one would greatly benefit by showing the corners of the backing. ALso the back of the photo if there is any printing on it.
Cheers,
China