That's cool info, but based on the CRL I don't think the neck trim should need to be replaced on the ANOVOS for Centurion.
The CRL says:
Neck trim shall be of an s-type profile rather than a u-type profile.
The ANOVOS trim is most certainly an S-Type profile rather than a U-Type. The stuff you ordered is probably more accurate, but that doesn't mean its required for Centurion. Until there is some official announcement about the ANOVOS S-Trim being insufficient for Centurion, I'd hesitate to buy new trim.