Will I need to flash BL (BootLoader) when flashing a Pit file using Odin ?

Hi XDA,
I did a lot of research on how to change the CSC code on my brand new Galaxy S7 (SM-G930F).
I have a couple of questions before I flash the stock firmware from Sammobile.com.
Why I want to change the CSC code:

The phone is bought in Denmark, and comes with Customer Specific Customization (CSC) from Germany (code: DBT).
I prefer to use the Nordic Countries (NEE) CSC code, since I want those customizations, and optimized drivers for the nordic operators frequencies

First of all, I need to flash the pit file (from what I've heard) because I'm unsure whether the NEE firmware is multi-csc (if it is, it will just go back to DBT as the CSC code after flashing the firmware).
So the files needed so far would be the AP (for the firmware itself), CP (previously called Phone, for the modem drivers etc) and the CSC (software tweaks for nordic countries).

But I've heard that flashing a pit file will wipe all data, does that include the bootloader somehow? And would I have to flash that too? Or is it not necessary?
And I suppose the "original" CSC code is stored in the pit file since I need to flash that too?

Hope you can help clear these things up :)

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