Indeed, hose grids exist and they are pretty similar among firms (also among techs), and very similar to one another.
However, you will never get the "official" ones -since the person who shares that would be totally violating the policies-.
However, the good news is that they are totally in line with the key aspects that you are being evaluated on, and the 4 different families of questions.
Precisely on this topic, the "Integrated FIT guide for MBB" has been recently published in PrepLounge´s shop (https://www.preplounge.com/en/shop/tests-2/integrated-fit-guide-for-mbb-34)
It provides an end-to-end preparation for all three MBB interviews, tackling each firms particularities and combining key concepts review and a hands-on methodology. Following the book, the candidate will prepare his/her stories by practicing with over 50 real questions and leveraging special frameworks and worksheets that guide step-by-step, developed by the author and her experience as a Master in Management professor and coach. Finally, as further guidance, the guide encompasses over 20 examples from real candidates.
Furthermore, you can find 2 free cases in the PrepL case regarding FIT preparation:
Feel free to PM me for disccount codes for the Integrated FIT Guide, since we still have some left from the launch!
Once you have that clear, you don´t need the gridline, since one mirrors the other.