The main differences are:
Fullblade 2h sword instead of Longsword (same proficiency bonus and more damage equals hells yes) thus no shield
3 lay on hands instead of 4 and only for healing surge instead of counting charisma bonus as well
Piercing Smite and Arcing Smite instead of Shielding Smite
Whichever way you want to do it. I'd be fine with just saying it's a bending of rules and it's a basic respecing of Markas if that's what you want to do or I can wait until after this adventure and go from there.
It's really up to you man.