Were The Earliy Shari’ahs Deficient?

assalām-o-alaykum

Please refer to Q 42:13 which says that the same laws of religion were ordained for all the prophets. However, we keep hearing from the Islamic religious clergy that Sharī‘ah of Muḥammad is different, better and somehow more complete then the laws ordained for previous Prophets. I do not have any ready reference regarding the above claims by clergy but I recall hearing such assertions many times in the past. Could you please give your opinion on this subject?
Best Regards
S Manzoor
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