The faction system is more complicated than just “am I the same race as you”. The game looks at your actions (helping/hurting their aligned faction), race, and religion to name a few.
So even though you would appear as an Erudite (same race) your actions (killing guards) would eventually make the guards hostile to you.
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[59 Troubadour] Saisu (Wood Elf)
[40 Paladin] Jharu (Erudite)
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