Identifying E101 and E102 purely by the front (E8, E78 tie in)

[G1911]

The two attached cards (not mine) are stated by SGC to be an E101 Cy/Irv Young and an E102 Sherry Magee.

This image of Young, with the same caption, is used in E90 American Caramel, E92 Crofts Cocoa, E92 Crofts Candy, E92 Dockman, E92 Nadja, E101, E105 Mello Mint, D355 Niagara, and T216.

This image of Magee, with the same caption, is used in: E92 Crofts Cocoa, E92 Crofts Candy, E92 Dockman, E92 Nadja, E101, E102, E105 Mello Mint, D355 Niagara, and T216.

The backs on both cards are E78, a rare and anonymous boxing issue about which nothing is really known and is not even proven to be a candy set at all yet. The reverses are similar to E77 by American Caramel and E102.

Is there any way to identify that the two cards are indeed from E101 and E102? Or did SGC just make something up again? As far as I can tell there is no way to actually ascertain this and they could from several of the above listed issues that use the pose and caption on similar stocks. It also seems unlikely that these are from 2 different sets (Young does not appear in E102). Am I missing something? Positive identification could have significant value in research trails for E78, which is my motive as right now trying to find primary source information on a set of an unknown time by an unknown issuer made by an unknown lithographer is a serious of seeking unknown unknown's in a massive haystack.