I would like to know whether I can upload the same image as a PNG and PJEG format?

People sometimes seem to give answers out of obligation or habit, without understanding the questioner's intention.
Asking about png and jpeg means asking about a picture with a white background and changing the white to transparent.
I'm not sure how Adobe bundles jpeg, png, and eps files of the same picture, but I understand that it's basically possible.
This is because when downloading a picture, the uploader often uploads the picture in three different versions.
Some sites require that you upload a jpeg first, then copy the code of the jpeg file and upload a png with that title. Only then will it recognize that the jpge file and png file are one set.
I don't know because I haven't uploaded jpegs and transparent pngs with white backgrounds. That's because I'm not sure how it's recognized as a set. However, I frequently upload jpegs and pngs with different backgrounds.
When downloading many pictures, there are both png and jpeg versions, so I know it is basically possible. However, there is no rule that the title must be the same, so it is ambiguous.

If I make a jpeg with a shadow, and a PNG without a shadow, is it considered a simile of mlm are these different files?

Sorry for misprint I mean JPEG.

PJPEG is not an accepted file format.

Adobe Stock accepts rasters in .jpg, or .png (with transparency), vectors in .ai, .eps or .svg format.

• https://helpx.adobe.com/stock/how-to/tips-stock-image-acceptance.html
• https://helpx.adobe.com/stock/contributor/help/vector-requirements.html
  
  

Hope that helps.

As I said...let some others chime in. 🙂 I was thinking along the lines that you were speaking of an image with a prominent subject against a complex background, which would be cut out for the transparent png. But yes, if both would set against a white background, just do the png.

They aren't really the same image, are they ? Because PNG's are to be used only for images with transparency, and your JPG will not have transparency...

If the png has a transparent background and the jpeg does not, I would think so. But let others chime in with their opinion.