Ian, the BMS module is inside the battery box.
Swapping the entire box is much easier than opening it and swapping individual cells.
There are no issues with wiring or BMS adjustments if you swap the entire box.
Possible minor differences may be seen in the VMCU because the power and weight of the car have changed.
99.99% of the users will not notice this.
The codes for using Torque Pro can be found by clicking the link in the website icon under my user name on the left.