Homebrew PCBs

Hi All,
I am using Boardmaker for making my howbrew PCB's. Printing is done 
on foil for transparant overheadprojector. I was using a old Olivetti 
JP250 inkjetprinter but the machine is broken down now.
I used the laserjetprinter output of the program. I understand this 
in in HP PCL3 language to the printer. The Boardmaker program 
supports printers like HP LaserjetII.
The new HP Inkjet printers use HP PCL 3 IMPROVED language. So my 
question is: is this new  language backwards compatible? Can I use a 
HP Deskjet 920 or 960 with my old Boardmaker PCB design software?
The program runs under DOS; Windows should NOT be detected.
Any help greatly appreciated.
ELSO.