BSIM4 cadence implementation

Hi everyone.

Is BSIM4 model implemented in cadence is anyhow different from the official one specified by BSIM group?

This derives from comparing a verilog-a model released from another company also implementing BSIM4 also against the cadence one and the results are somehow different.

For example parameters like PUA,PUB,WUB,WUC are not listed in BSIM4 2010 version manual but they appear on spectre manual. Usually for a model card (umc 90 for example) these are listed under other parameters.

Any ideas? 

Thanks,

Sotiris