I highly doubt it is just a different in occupation of Ishgard Astrologians vs Sharlaya Astrologians. Since the Astrologians in Coerthas are not battling on the front lines, and they are Ishgard civilians.
And it doesn't hold the significance of making the distinction between the two occupations. While you can give enough context to it, it'd be difficult to make the distinction without further explanations.
Such as, if you were to attempt to explain the following;I've made it sound silly intentionally, because it is silly.
- Can an astrologian also be an astrologian, or are they exclusively an astrologian?
- Do they need to train as an astrologian before becoming an astrologian?
- Are all Ishgard Astrologians astrologians, or can they be astrologians?
For the most part, it's not a big deal for us. Since we'll probably just default everyone to being battle astrologians...
Such as if I were to ask for your phone number out of the blue without any context, you'd probably think cell phone number by default rather than home landline hone number, or work number.
But if this were an actual occupation, can't you imagine the confusion? It's like the difference between calling someone a field medic oppose to being a general physician.