Well, if you compare the configuration of (say) a hAP Ax lite against that of (still say) a hAP Ax2 or Ax3, you will find out that they would differ in two relevant parts:
- only the 2.4 GHz radio interface will be present on the Ax Lite as opposed to both 2.4 and 5 GHz present on Ax2 and Ax3
- only ports ether2-ether4 are into the bridge on the Ax lite (because port ether5 doesn't exist) while on the Ax2 or Ax3 ports ether2-ether5 are added to bridge
So if you take ether5 port out of the bridge on a hap Ax2 or Ax3 it will work just fine, like an Ax lite (but with two radios).
An import may (or may not) fail anyway BTW, the usual recommendation is to NOT import a whole configuration file but rather copy/paste snippets to have more control on what happens, of course starting with the settings needed to have the offbridge port functioning.