Edit: Wait, hang on. The beachv1.zip 32px files are significantly more antialiased, almost as if they're just the 48px versions shrunk down. It also has a few other miscellaneous differences, such as the open umbrella missing its stand and the rocks looking completely different. (And one of the rocks from this sample map apparently just doesn't exist in v1?)
Meanwhile, the beach.zip ones have been worked over to sharpen and bring out the pixel clarity, but the rocks look a bit less detailed and, more importantly, there's that error with the borders on a lot of the tiles.
So the beachv1.zip version looks visually blurrier and is missing some things, but it does at least fix the alignment issue, FWIW.
