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Hi! @sherwin256, Thank you for visiting the HP Forums! A great place where you can find solutions for your issues with help from the community!
 
I understand you would like to know the difference between HP Zink 50SH AP2 Gls Adh Photo Paper and HP Sprocket Photo Paper-50 sticky-backed sheets/2 × 3 in.
 
Don’t worry I’ll try to help you out.
 
Did you make any changes to your printer?
 
Are you printing using HP ZINK® Sticky-Backed Photo Paper?
 
I have checked the records and found there is no difference between both the papers. 
 
It’s just a terminology used to market the photo papers.
 
Please, the few steps recommended below.
 
Use these recommendations to help improve print quality.
Use genuine HP ZINK® Sticky-Backed Photo Paper. ZINK® makes custom photo paper for a variety of printers, such as Polaroid, LG, and HP. HP recommends using HP ZINK® Sticky-Backed Photo Paper for best results. To purchase genuine HP ZINK® Sticky-Backed Photo Paper, go to the HP Sprocket homepage. You can also purchase genuine HP ZINK® Sticky-Backed Photo Paper from other retailers.
Clean the output rollers with the blue HP ZINK® Smartsheet from the same pack of photo paper currently in the printer. Load the blue HP ZINK® Smartsheet into the input tray with the barcode facing down and the photo paper with the print side 
 
Refer this article to know more information about HP Zink paper. Link
 
 
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Hope this answers your query!
Have a great day! 🙂
 
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