Correct, the brake master cylinder, fluid reservoir, and brake booster assembly are identical on all model E60s. But there is nothing about the braking system in any E60 which is affected by computer coding or programming other than the DSC unit. Hydraulic pressure applied from pedal force to the brake lines is due to pedal pressure, nothing else. At least not until the DSC unit intervenes by venting fluid pressure off (anti-lock) or applying pressure to one or more calipers (traction control). The DSC unit itself has it's own hydraulic pump driven by a DC motor on the unit. This is how the DSC generates pressure, not from the brake master cylinder.
There's nothing in the coding of the vehicle which can affect braking pressure except the DSC unit unless I'm not understanding what you're asking for.
I've dismantled about 30 E60 M5 and E63 M6 for salvage and sold many sets of calipers and rotors to non-M E60 owners.