I am with Steve on this.
the lack of provenance is significant.
I would need to see an improved image of the more recently discovered photo to make an untrained comparison and opinion.
The differences in facial features can be attributed to changes in age, weight and especially health. Poor health can really change a person's appearance. Her face appears to me to be longer and thinner in most recently discovered photo.
Give me another 20 years, a bonnet, a little eye shadow, a loose fitting dress, slightly out of focus image and I might look like Sarah/Sally.