Neither of the depicted images are the original. The white on black appears to be a lithographic print, which were produced from around 1860 onward by others discussing Rosses' work. The black on white appears to be an inversion of the white on black image.
Examples of the drawings as published, which were engravings, can be seen in https://archive.org/details/s3id13528860/page/912/mode/2up e.g. on page 912. These are black on white.
The original drawings in the observatory ledger, were hand sketches using pencil on white paper, and comprised notes, multiple rough sketches, and dimensioned sketches of features. It is believed that the rough sketches were combined into a single ink on paper drawing that was sent to an engraver. There is a note somewhere in one of Rosses' papers that he accidentally used standard ink rather than india ink, that ran when the mail on the way to the engraver got wet, and the plates from the engraver required rework before they were suitable for publishing.