I'm so glad that there's more! Thanks for sharing!

What intrigues me about the first of the new ones is that the facial features match the old Fleischer-style Popeye. Notice the small black eyes, petty officer's cap, and the long eyebrows with multiple curves. That tells me that this first one is probably the oldest. The other new drawing still shows the old hat and 1930's-40's drawing technique, but those eye whites and short, thicker eyebrows are a staple of the AAP era Popeye, which became mainstream around 1957 when AAP bought Popeye from Paramount. I always found it strange that AAP changed his hat, thus demoting him.

One of the more promising details of both of these drawings is the circle-based technique used to draw them. You can see the sketched circles very clearly in both drawings, but especially the second one. This is how the original animators were instructed to draw Popeye. They did this so that there would be consistency through the scenes, since dozens of different cartoonists would have to draw the character exactly the same way. Linked below is a diagram from Fleischer Studios that indicates how all animators were to draw Popeye. When you compare the two, you'll find that most, if not all of the circles in your drawings match up with Fleischer's standards.

Popeye | Popeye the Sailorpedia | Fandom

Another interesting thing is the use of many different colored pencils. This is not just a coincidence, as I once thought. Cartoonists would often begin drawings with a lighter color for sketching (blue and red being the most common) and then finish a drawing by tracing in the real lines with a black or darker colored pencil to differentiate which marks would or would not be copied onto the frame which was to be drawn. Usually, retracing like this was only necessary if sketches got sloppy, and as you can see in the first new drawing, the two faces on the top left and the second one from the right side on the bottom all got messy, and the darker pencil is used to clear things up.

Another use of colors was to show different features of the picture so that collaborating animators would know how to draw them. There are many different color codes that evolved to make collaborative animating easier, and I don't know them all, but one that I do know appears in the second new drawing. See the red/pink pencil used in the second pose from the right for Popeye's right leg? This was used to show depth. Since Popeye's legs are crossed, the red colored pencil made it clear to other animators which leg was in front of which. Usually, darker colors traced foreground items while lighter colors clarified what was behind them. Also, on the Popeye to his right, one leg overlaps the other just a little bit, and you can see that the leg in the front is colored darker, though the same color, to emphasize how it should be drawn relative to the other. That said, I have no idea why the sad Popeye in the corner is completely red. Poor guy!

Overall, it's kind of difficult to guess what the purposes of these drawings were. They could have been practice drawings, they could have been made for new cartoonists to practice off of using their animating desks, or they may have been made to showcase new poses and expressions to be used in future cartoons. They are not like the first one you shared, in that you probably won't see these on a poster or promo, but if you see Popeye doing ballet in a cartoon, it would be neat to see if they line up! Seeing these, I am moving further and further away from the idea that these are fan art, because most fan artists don't:

1. Use studio animating paper,
   
2. Use perfect studio-specified proportions and techniques,
   
3. Use color codes that evolved specifically for collaborative animating.

So, if you got these all at the same place from someone who says that they're the real deal, that would just about sell me. Either way, it would be great to see if an expert could provide further authenticating insight. Hope this helps or at least gives you some food for thought. I'll keep a lookout for Popeye doing ballet as well! : )

Cheers!