I haven't taken an advanced wreck course, but I have looked at several course descriptions. I can assure you the advanced wreck course will come nowhere close to accomplishing the same thing as a cave course. Advanced wreck requires 6 hours classroom and 6 dives with an average cost of $400. Full cave requires lots more classroom and 16 dives minimum with an average cost of $1600. It's a big downfall of the wreck diving community, but they really didn't have anyone like Sheck Exley to formalize any kind of training.