Good catch!
Yes, I think you're right. I can never tell them apart from their icon, especially since the icons change depending on the array dimesionality and between palette and diagram.
Notice that "replace array subset" has two shaded squares on the right when viewed in the palette, but only one shaded square when placed on the diagram?
(Has anyone ever figured out what to connect so the "replace array subset" icon looks like its icon in the palette?
😉 ...or that it shows that little dotted arrow like in the palette view?)