These switches are identical in appearance except for the model number on the front. The configuration and management ports are on the rear panel along with the power supplies and the fans:
Information below is merged from two switch data sheets with prices from June 15, 2021 switch info sheets. It is not entirely clear that the 10 Gb/s switch is a Trident3-X4.
The switches come with FSOS. There is no ONIE loader. These are not open switches. Against the possibility of confusion, the Trident2 based N8550 does have ONIE and is on the cumulusnetworks hardware compatibilty list.