Short answer is yes.
MA-ANT-21 is for 5GHz band
MA-ANT-24 is for 2.4GHz band
2x N-Type antenna ports are located at the top of the MR72 and 2x are located at the bottom of the MR72. The pairs of antenna ports each correspond to the 2 client serving radios. The spectrum that each pair serves is printed on the shell of the MR72.
https://documentation.meraki.com/MR/Installation_Guides/MR_End_of_Sale/MR72_(EOS)_Installation_Guide
