Items duplicate spell effects, or cumulative?

[Yossar]

Originally posted by Cohen:
I add another item question ...

Does defaul items have same properties of the forged counterpart?

Some examples:
Virtue/Angels of the Host flambeau: *3 damage vs undead and daemons?
Some Devils have "hell sword" or "demon whip" or other similar weapons ... do they've the replenish hp and fatigue // fire additional damage, like the forged item?

Yes, it's exactly the same as having that item equipped. Except that you can't lose it or unequip it and you can equip something else instead if you want to.