Do these photographs show the same people?

This blog post is a follow-on from my Sunday blog post series - Someone's Ancestor Sunday - Susan Ellis (nee Hehir) Photo Album. It appears that two of the "unknown, unnamed" photographs from my Great Great Grandmother Susan's album could actually be one of her sons and one of her daughters! 

Please let me know your opinion...do these photographs show the same people?

Is the young man in photo 1 the same person as the older man in photos 2, 3 and 4?
Photos 2, 3 and 4 show Susan's son Tom Ellis (1874-1962). 

Is the young woman in photo 1 the same young woman shown in photo 2?
Photo 2 shows Susan's daughter Susannah Ellis (1865-1955). 

Here are the two photographs as they originally appear in Susan's album.

Photograph of an unknown young man from Susan Ellis (nee Hehir) Photo Album.
Could this be Susan's son Owen Thomas (Tom) Ellis (1874-1962)?
This photograph is a Cabinet Card, c1880s. There is no writing on the back of the photograph.
The writing at the bottom of the card is as follows: "Extra Copies, 1s. / Academy of Photography. / Next School of Mines. / Hansen, Bendigo. / Enlargements from this or any Photo from 5s. to 25s." 

Photograph of an unknown young woman from Susan Ellis (nee Hehir) Album.
Could this be Susan's daughter Susannah Ellis (later Cowin) (1865-1955)?
This photograph is a Carte de visite, c1880s. There is no writing on the back of the photograph.
The writing on the bottom of the card is as follows: "Stewart + Co. / 217 & 219 Bourke St. East / Melbourne"

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