Rank of a Centurian in the Auxilla

[brennivs - tony drake]

Yes this seems to be a grey area, I know that Legion Centurians were some times posted to the Auxilla as Centurians or as Prefects but on there pay scale.  But what pay scale were Auxilla Centurians,  I presume they must have been in line with the Legionary Centurian even if the title was not the same?  I know the head Centurian  of a Auxilla is not a Primvs Pilvs  but to me he has a responsibility for the whole unit and to the Prefect? Or am I just looking at it too deep
Thanks for the imput Nathan and Longinvs.
regards Brennivs