The same print job or 2 different ones? Two different print jobs can be
sent to two different printers, but one job is spooled by only one at a time.
I have tried that, maybe another reader has a resolve or a work around.
Print job "A" will only print to whichever printer is designated as
the default printer, either 1 OR 2, not both. One possibility you can
try, is to send the print job to the default printer, once spooled, and
printing, designate the other printer as default and then print to that one.
Try it, it may work that way.