England bounced back from a 30-28 defeat in the opening Test – in which replacement van Poortvliet scored his first international try – to win 25-17 in the second meeting at the Suncorp Stadium in Brisbane.
Leicester Tigers centre Porter was an unused replacement in the first Test of the summer but was given a starting role at centre for the rematch, joining club colleagues Ellis Genge, Freddie Steward and scrum-half van Poortvliet in the team. Joe Heyes and Ollie Chessum were again used as replacements.
England made a bright start, with Genge and van Poortvliet prominent, as Billy Vunipola provided the opening try from a lineout move.
Owen Farrell’s kicking stretched that gap to 19 unanswered points before the Wallabies got off the mark just before half-time with a converted try from prop Taniela Tupou.
Chessum gained his fourth cap as a replacement for Maro Itoje a minute before the break.
The Wallabies lost full-back Jordan Petaia to injury early in the game and then also his replacement Izaia Perese just a minute into the second half, but claimed the first try after the restart from centre Samu Kerevi to make it 14-22 and then reduced the deficit to just five points with a penalty after Marcus Smith had been yellow-carded for a deliberate knock-on.
Tighthead prop Heyes joined the action on 60 minutes, with Farrell adding his fifth penalty to put England more than a score in front again with quarter of an hour remaining on the clock.