Plane Update from 3.8 to 4.3.2 new tune needed? INS_FAST_SAMPLE parameter

Hello folks,

happy new year everyone and thanks in advance to this great community!

I just updated the firmware of our super reliable survey plane (RVJET 1950 mm) from 3.8 to 4.3.2.
Can I still fly with my dialed in autotune parameters from V3.8 or should I tune again?

Does anyone have experience with the INS_FAST_SAMPLING parameter?
It was set to 1 (second IMU) in V3.8 and now is 5 by default. The Bitmask only has values of 0:1st, 1:2nd and 3:3rd IMU.
Does the default value of 5 deactivate fast sampling? Should I set it to 1 - 2nd IMU again?

Thanks a lot for you help!