Another version of Rin again? Uff. Hope that she doesn't represent a new character this time.

That's just Extra Rin. Technically not the same as FSN Rin but pretty much indistinguishable.

but pretty much indistinguishable.

With the VR world sure, outside of it this Rin (whom turns out to a cousin to THE Rin Tohsaka) has one very notable distinction. She is blond. Grand Order's ereshkigal_(fate/grand_order) is based on her from a visual stand point.