My thinking(MS406 = MS410) was wrong...
Simply copying and renaming brought a change on the position of the oil radiator in MS410.
So it was necessary the files 'MS410(Multi1)' from master Epervier, too.
If I explain my method around it...
1. Copy and Paste(overwrite) all files (except hier.him) of MS406 having new-stick in the folder '#pilots france' into the MS410 folder of Epervier . --> This will be caused the pilot's head to be pushed back.
2. So erase [Pilot1_D0][Head1_D0][HMask1_D0][Pilot1_D1][Stick01_D0] in hier.him of MS410 folder
3. Copy and paste [Pilot1_D0][HMask1_D0][Pilot1_D1][Stick01_D0] in hier.him of MS406 folder into hier.him of MS410 folder .
4. Check if there is any abnormality.
Once again, thank you to all the Modders who were willing to provide the files...