There is duplication within astrology.
Like most (if not all) languages, more than one word can be used to convey the same or more accurately — similar meaning.
Fixed stars, for example, are duplicated in other ways within the chart and vice versa. For example, my own Moon Conjunct Denebola in the 8th can be restated as my Neptune in the 10th or Mercury Semi-sextile Uranus straddling my 9th. Of course, Moon Conjunct Denebola is the most precise way of saying that what I see, many others do not.
Thankfully the language (of astrology) has been written so that you don’t need to know ALL THE WORDS (symbols, data) in order to get the meaning and understand things fully.