Matsushita cross flashing

I just bought a Panasonic / matsushita uj 120 blu ray combo drive and have read sony uses these drives as well now the one i bought is an hp model i cant find any support for this with hp can i cross flash it with a sony firmware if so which one would be best?

will this work ?

http://esupport.sony.com/US/perl/swu-download.pl?mdl=VGNAR730EB&upd_id=4454&os_id=28

Where have you read that??