Hello all,
Im new to Armbian and sbc's.  I have a OPi Z+2 and NPi Neo Air and they are both being used for the same purpose,  will use 2x UART and I2C.
I will add software bundles to Debian image for production use.  Can anyone tell me if I can use the same Armbian image on both devices ?  ie make a single image and then just rely on the Overlay selection on the image to allow our custom software to access correct GPIO automatically for both board types ?    
Thanks for any advice.
Chris

Should be possible. I want to mention two things here:

First: https://docs.armbian.com/Developer-Guide_User-Configurations/#user-provided-image-customization-script

This allows do add customizations to an image right before it is being packed into an img file.

 

And 2nd have a look at:

 

Thanks very much Werner.  I'll have a look at the links you provided.