Samoa appear to be improving at least, having shown good signs against the Kiwis after a warm-up hammering by the England Knights, and coach Matt Parish wants to see further evidence of that against the Kumuls.
"We need to improve, get our combinations right and fix things up," the former Salford boss said.
"We need to beat Papua New Guinea. They're coming off a loss and there are going to be two desperate teams at Hull on Monday night.
"Everyone (in the team) had quite a bit to say after the England Knights game - we always knew we would struggle in that game. I had trained them very hard and knew we would be flat.
"But we fixed some things (against New Zealand) and we have need to go away and improve again. It's all about the bigger picture for us."
Papua New Guinea are assured of another warm welcome at Craven Park, with Hull KR having adopted them as their second team.
The relationship stems back to the arrival of PNG icon Stanley Gene in 1995, when he impressed sufficiently enough at the World Cup to earn a contract.
Wakefield hooker Paul Aiton is already playing in the Super League and he does not see a reason why, if they perform as they did against France, his team-mates cannot follow in Gene's footsteps and join him.
"As you could see, the level is high and that was just the one game," Aiton, currently linked with a move to Leeds, said.
"The standard in Papua New Guinea is what it is and it is a big step up to international matches. But we have boys who can rise to the occasion and who did that against France.
"We know what they would be able to do if they got over here.
"Stanley Gene is the perfect example of what can happen if you apply yourself and we hope that the other boys can get those chances."
Aiton is free to play after winning an appeal against a one-match ban handed out for a high tackle against France.