Both strikers struck twice in the 4-1 win.
"I think Danny's goal against Scotland might have helped lift his confidence," said Moyes.
"His goals were really good. I was more pleased with the first one. If you are going to be a centre forward you need to get tap ins. He was in the right spot to score.
"Robin has been a pleasure to work with. I have really enjoyed seeing him in action. You might think how good can he get? But he is someone who wants to keep working to get better and find new ways of scoring goals."
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