I'd say:
Falcon=PP7
MagSec=DD44
CMP=ZMG
K7=KF7
AR34=AR33
RC-P120=RCP90
LaptopGun=Phantom
Dragon=D5K
Super Dragon=GL for secondary fire
Sniper Rifle, DY357 Magnum, Mines, Knifes and Shotgun are obviouse i think.
Cyclon and some other weapons, especially the alien ones of PD don't really have a counterpart.
Maybe one of these could replace the laser, but it wouldn't really work like the original weapon.
In the end, even doing this quick and dirty skinswap approach would require some serious effort
noone on the team would be willing to invest his time into right now.
In the end there would be next to no benefit in doing this, even if we could get permission to use the weapon models of PDS.
And even once we can call GES Multiplayer completed feature and content wise, i'd only considder doing things like that if there's a way to limit the alternative skins for weapons, items and maybe even playermodels to the PD maps.