I believe the top wreck may be the wreck in question...
'Duckenfield'
A collier of 368 tons en-route to Sydney from Newcastle, the 'Duckenfield' ran on to Long Reef, north of Sydney Heads, on May 24th, 1889. She slid off the reef and sank in deep water soon after being abandoned. Now resting in 24 metres of water, the remains of the 'Duckenfield' are scattered over a wide area. Prominent features include the boilers and heavy-duty winches.
'Royal Shepherd'
The victim of a collision, the 'Royal Shepherd' went down in 29 metres of water at the entrance to
Sydney Harbour on 14 July, 1890. Built in 1855, the 331 ton collier is one of Sydney's more popular wreck dives. Although the superstructure has disintegrated the prop shaft, fly wheel and large boilers form the main aspects of the wreck which are now covered with soft sponges.