Is it possible to transfer settings between these models?

Thanks

You can't do that directly because they're dissimilar models, but you can move across the important things like the Firewall / VPN / Bind IP to MAC lists, using the modular backup/export, which requires the latest firmware on the 2860:

Modular Configuration Backup on DrayOS routers

OK, thank you. I have updated firmware on the 2860 recently so should be OK to use the modular backup.