The CutePDF has scaled the C-Size to near A-Size, but with an additional reduction for margins. The direct export also looks to have improper margins and scaling, but the margins are smaller than the CutePDF margins. Look to change any scale and X and Y offset options in the print setup.
Neither example is an even / useable scale; CutePDF is smaller than 1/2 and direct PDF is smaller than 1/1.
Per the ASME standards the drawing outer boundary should exactly match the paper size - and in the case of exact size reproduction, never be printed. The outer boundary used to be the line where the paper was cut when pen-plotted to a larger sheet of paper and is not part of the format. Larger paper was selected to prevent the pen from damaging the paper where then pen was set down just off the edge and dragged onto the middle, tearing the paper and sometimes destroying the pen.
Since then laser printers are often used with exact size paper. These printers are often unable to print to the edge of the paper in an effort to prevent contaminating the rollers with excess toner that does not fall upon the paper. Software frequently rescales the print to fit within the toner-capable area or the user risks the printer simply not applying toner near the edge areas of the page, leaving the order incomplete. Pure optical photocopiers usually do the opposite for a similar reason - they scale the page up slightly to avoid copying the shadow of the edge of the original onto the copy.
