It was initially advised to Speedcafe.com by the team in May that the pairings would be the other way around.
Click here to have your say on the state of Australian motorsport and go into the draw to win a Kincrome Tool Armour Workshop valued at $11,999.
Reynolds denied the idea of a switch in co-drivers, claiming a decision on who would partner who was not final until recently.
“At the start of the year everyone assumed things but there was nothing determined in terms of which of the Matts we would be paired with,” said Reynolds.
“I think they only got together recently to decide what was going to happen; I was happy with either one.”
The 37-year-old said he was not involved in the decision-making process, but was comfortable with either co-driver.
However, the 27-year-old is no stranger to Mount Panorama, having won the 2019 Bathurst 12 Hour.
“No, I wasn't involved in the decision. I'm just another wheel in the cog of motor racing,” Reynolds quipped.
“I really rate Matt Campbell, he's a world-class driver and he's my height and my size,” he added.
“He'll slot straight in and hopefully we won't have to much around pouring seats, which is one of the worst things to have to do during the year.”
Campbell will be absent from Friday's co-driver practice session at Sandown due to overseas commitments.
Supercars will be on track for Practice 1 shortly.