Assets/Guns/Resources/Shotgun.prefab
Assets/Resources/Guns/Missiles/PlasmaGun.prefab

var shotgun   = Resources.Load<GameObject>("Shotgun");
var plasmaGun = Resources.Load<GameObject>("Guns/Missiles/PlasmaGun");

Assets/Resources/Enemy.prefab
Assets/Wounded/Resources/Enemy.prefab

Assets/Resources/Enemy.prefab
Assets/Resources/Wounded/Enemy.prefab

var enemy        = Resources.Load<GameObject>("Enemy");
var woundedEnemy = Resources.Load<GameObject>("Wounded/Enemy");