What is the difference between SCACT and "CGDCONT= without APN" AT commands?

What is the difference between AT+CGDCONT=3,“IP”,"" and AT!SCACT=1,3 commands?

AT+CGDCONT=3,“IP”,"" is to clear the apn of profile 3.

AT!SCACT=1,3 is to activate data channel via profile 3

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