Booklet Pane Sc#2531A, White And Yellow Paper?

My questions pertains to Sc#2531Ab. I have two of these panes, one is printed on white paper as described in pertinent resources. I have a second one printed on YELLOW paper. I have not been able to find any information in the yellow one.
I have included a picture of the white and one of the yellow one. The yellow doesn't show up correctly. The real pane is quite a bit brighter yellow. I have also included the back of both panes. The back of the white one is as described in the Scott catalogue. The yellow pane has a different back. It is in black writing except for the words "Self-adhesive Stamps, and the torch which are in green. Any help on this is very much appreciated.
Thank you!

From your description, one is Solid tagging and the other overall tagged. The yellow (ivory) one is the overall tagged version. I have example tagged images on the stampsmarter site.

https://stampsmarter.org/features/Tagging

Go to the DB and use the "Search by Catalog Number" to see the images.
Go to the DB and "Search by Catalog Number"

Thank very much. It got my attention because of the brite yellow cover and the different back cover. I could not find any reference to the two different back covers. Thanks again!