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There is a lot of differences in the fronts.. ..but backing up front the nose...it gets smarter... the bonnets are all the same profile outline as are inner guards and more.
Easier to see or printable illustration HELP page is linked here ... 70-81 Camaro Front End
In 1972-73 front bumpers, supports & absorbers changed to accommodate the low impact collison laws introduced.
Overall..Engineers made a pretty easy & adaptable designed GM car to work with through a decade
that went from full on performance - to safety - to the intro of tougher emission standards, coupled with the Arab Oil Embargo.