Using Disk Images on new Pis

I have 12 Pis running HATs with the Telit module for a remote monitoring project, can I use a ‘disk’ image from my 1st working prototype to build all the other units or do I need to go through the install process on each Pi ?

I’m wondering because the 2nd unit (which I did this way) is failing to get a GPS fix.:: Yes I’ve done all the ‘have you plugged the antennae in, can it see the sky clearly’ things but still no fix after 3 hours of ‘empty’ NMEA sentences.

The only difference between the Pis that I can think of is the MAC addresses, other than that they should be identical as they are brand new out of the box units.

Any suggestions most welcome.