Thank you for your answer,
I used 3dAllineate, first by moving the MNI space to native space in order to generate the transformation matrix and I then applied this matrix to convert the mask into native space
This is the output from 3dinfo -same_all_grid:
0 0 1 1 1 stats.test
0 0 1 1 1 WenickeinNative
That is the output from 3dinfo -space:
ORIG +orig stats.test
ORIG +orig WernickeinNative