Is it okay to transfer the configuration backup between identical hardware? All devices are on the same software version. Just a bit worried that MAC addresses are in software and we’d end up with devices with the same MAC addresses which would be bad news 
Although answering my own question, possibly not a good idea as I can see lines like this:
set [ find default-name=ether1 ] mac-address=48:8F:5A:60:9B:78
set [ find default-name=ether2 ] mac-address=48:8F:5A:60:9B:79
set [ find default-name=ether3 ] mac-address=48:8F:5A:60:9B:7A
set [ find default-name=ether4 ] mac-address=48:8F:5A:60:9B:7B
set [ find default-name=ether5 ] mac-address=48:8F:5A:60:9B:7C
Just use /export and import on other devices.
And yes, you should remove unwanted MAC addresses from exported configuration.
And Wi-Fi interfaces aren’t right… I guess the right answer here is to /export, reset without configuration and bring run exported script?