According to the initial announcement, Pacific Explorer will replace Pacific Independence for one voyage, after which the Tasman Provider will take over as per the following extract.
"Due to unforeseen circumstances we are off-hiring the Pacific Independence urgently in Singapore, and replacing her with the Tasman Provider beginning in New Zealand on 15th July.
As such we are having to change our Southbound schedule and cargo to Lae, Honiara, Fiji and New Zealand involving the below changes.
The Pacific Explorer 031S will now replace the Pacific Independence 1117S voyage and call Lae, Honiara, Lautoka and Suva, and omit Melbourne. The Pacific Harmony 019 will now call Darwin on the way to Port Moresby."