The main differences in the presentation are the perspective and the focus on the movement in the scene. For me, it seems that the pools and the nymphs are an allegory for something else. The illustration on You are not allowed to view links.
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Login to view. gives the impression that the nymphs are flowing from one pool to the other. Essentially, they are moved (by the liquid). The central picture is the composition as a whole. I would not see the entry and exit in the last pool as self-contained. This is just an indication of the end of a sub-process and the beginning of a new one.