Hi Slilent Steel - you were correct before.
Cerberus62 Corrected Depth Charge Projector 1.0 is not in OHII (It does have his extra ships mod).
OHII and Cerberus62 Corrected Depth Charge Projector 1.0 both use the sea folder so you may get a warning with jsgme, but they will work together without any issue