The two are not the same person, and they might not even be sisters. However, the movie reveals that Sister Irene and Lorraine Warren are from the same bloodline. This was revealed when the movie explored Sister Irene's heritage, and it showed she is a descendant of Saint Lucy.

Patrick Wilson and Vera Farmiga star as Ed and Lorraine Warren, paranormal investigators and authors associated with prominent cases of haunting.

This is correct, Warzone 2 is heavy on the CPU and would explain the GPU not being fully utilised. Increasing image quality settings (or display resolution) would increase GPU utilisation. Is the game running okay though? If so I would not worry too much that the GPU utilisation is not maxed out.

Graphic Processing Units, or GPUs, are found as elusive items that can be sold for high amounts of cash in the DMZ mission mode of Call of Duty: Warzone 2.0 that exists outside the typical battle royale.