They are the same

Here's what to do in the mission.
When the mission begins, you'll notice all the purple mists blocking the way of certain paths. Those mists act as teleportation devices that lead you to certain areas of the forest. They do not trasnport you randomly, so try to remember where you go with each one.
The doorway exit is locked, so jump down to the area below to encounter some enemies. They are not necessary to beat so proceed to the purple mist dead ahead and go
through it to teleport to the next area.
In the next place you fight some annoying enemies, beat them. When the area is clear, IGNORE the two paths on the right side. They lead to nowhere, so approach the purple mist on the stairway going to the Ruined Church to teleport to the next area.
In the next area just beat the enemies and proceed through the normal way.
When you enter this area, there are still some guyz. You DO NOT have to fight them! Instead of fighting, go under the bridge to find the purple mist and enter it.
Enter the church. After that go out through the door. In there there's the shadow puzzle. Just go opposite of the altar's shadow every time.
And then there's a path, some enemies and after that the boss. I hope I helped.