Likely the printer you are referring to is different between NORMAL and L1 -- perhaps due to the printer default settings. For example one may be landscape, the other portrait, different paper sizes, different margins, etc.
What we normally suggest if once you have opened any graphical printer (*winprt* or *pdf*) you set the default font and size as in:
OPEN (nn,OPT="ORIENTATION=PORTRAIT; MARGINS=.25:.25:.25:.25") "*WINPRT*..."
PRINT (nn) 'FONT'("Courier New",-12), 'DF','LPI'(6),
This should get you a 12 point high font (1/6 of an inch) which and sets 6 LPI.
This should give you consistent results assuming the paper and printers are the same.