Unfortunately, your question is not fully allowed here due to the device manufacturer (Ubiquiti) not offering any sort of paid support option.
However, as a generic/brand-agnostic question, if you can export the config to a flat text file, yes, you can move between models. You will likely have to account for making a few changes, though, such as interface ...
Connecting two fiber trunks is a tedious process. Those are splice cassettes for optical fiber - each single fiber is fusion spliced and looped into one of the cassettes for protection. Afterwards the whole box is sealed and buried or put in a cabinet.
They're a fiber splicing crew. The white plastic trays are used to organize fiber connections.
A waterproof enclosure will protect the whole assembly from debris when their job is finished, and the enclosure will be stowed somewhere, e.g. in an underground chamber or an above-ground pedestal.