Some flora will be the same but known by a different name, and so will be easy for her to find in apothecary shops. Others will not. Precisely how you want to play that is up to you.

While staying in the Queen's Residence, Davina will have access to the Queen's personal library which has plenty of books on herbs and plants that would be of use to Davina should she like to borrow some. The library in River East also will have plenty of books, and Loren, Verim, and Fayura herself would all happily assist her in finding analogs. Well. Verim and Fayura will be pleasant about it. Loren will likely be fussed that his attempt to make a dent in his paperwork has been interrupted.