North's return sees Leigh Halfpenny (Blues) switch wings to the left side vacated by Brew and a further positional change in centre moves Scarlet Scott Williams out one spot to accommodate the return of Roberts at inside centre.
Wales' most capped player Jones (101) and centre Davies take up places on the replacements bench with scrum-half Knoyle and wing Brew omitted from the 22-man match-day squad on this occasion.
Up front hooker Huw Bennett and prop Adam Jones return in place of Exeter Chiefs Craig Mitchell (prop) and Dragons hooker Lloyd Burns, with Burns moving to the bench.
In the second row Blues lock Bradley Davies is retained and partnered by Dragon Luke Charteris, with Osprey Alun Wyn Jones asked to provide cover as a replacement.
Elsewhere on the bench Blues scrum-half Lloyd Williams keeps his place after making an impact last time out in New Plymouth, back row Andy Powell (Sale Sharks) is also retained and Ospreys prop Paul James completes the line-up.
Not aconsidered for selection this week were Shane Williams, who is recovering well from a thigh strain, Dan Lydiate (ankle) and James Hook (shoulder).
"Shane might have been available to us if we had pushed him, but he has taken a limited part in training this week and we are happy with the back three we have been able to put on the field for this game," said Wales head coach Warren Gatland.
"Alun Wyn (Jones) and Jonathan (Davies), are two of the players who have started in all three games so far and so we have freshened things up a little in the second row and the centre, but have both of them on the bench if we need them.
"In the front row Huw Bennett comes back in after resting up last week and Adam Jones also adds his extensive experience. Rhys Priestland, Mike Phillips, Jamie Roberts and George North are all also back in and we will be very much asking them all to continue where they each left off the last time they took to the field."
Wales' Pool D opponents South Africa and Samoa face each other tonight (Friday) in Auckland and, with the meeting with Fiji not occurring until 48 hours later, Gatland and his charges will know exactly what they have to do before kick-off in Hamilton on Sunday night - but he is not expecting any change of mood as a result.
"Our focus is entirely on Fiji, we know if we can win one more game, and win it well, that will give us the best chance of reaching the quarter-finals of the Rugby World Cup with significant momentum," added Gatland.
WALES: Lee Byrne; George North, Scott Williams, Jamie Roberts, Leigh Halfpenny; Rhys Priestland, Mike Phillips; Gethin Jenkins, Huw Bennett, Adam Jones, Bradley Davies, Luke Charteris, Ryan Jones, Sam Warburton (C), Toby Faletau
REPLACEMENTS: Lloyd Burns, Paul James, Alun Wyn Jones, Andy Powell, Lloyd Williams, Stephen Jones, Jonathan Davies