1. It means different. A printer refers to a machine used to print and copy documents, while a printing machine refers to a machine used for printing.

2. According to different classifications, the paper printed by the printer is A, A1, A2, B1, B2, A4, A5, etc., while the paper printed by the printer includes coated paper, offset paper, trademark paper, kraft paper, corrugated paper, bag paper, cellophane, moisture-proof paper, white cardboard, etc.