Technical difference between Impact and Crown

As far as I understand both are technically different guns. In this matter I would disagree with TED.

As far as I know the Impact has a valve travel adjustment and it has many settings in this adjustment while the Crown has just transfer port adjustment and only three adjustments of transfer port are there just like Royale.

This can cause major limitation in fine tuning the Crown as compared to Impact.

Please correct me if I am wrong in this analysis.

Regards,

Umair Bhaur