For me as a non-N17 player, all the Van-Saar las weapons look like lasguns and I would struggle to tell the difference. People can use whatever they want as whatever they want though. This is why I am actually pretty dead against this kind of weapon conversion chart as people begin to feel like its official and they can no longer be creative.I just think it's a bit silly for the new van saar gangs as if you translate them all to straight laspistol / lasgun you restrict an NCE van saar gang to being armed with laspistols, lasguns, plasma guns and heavy plasma guns as they don't have ANY other weapons on their sprue that are on their NCE HWL or that are common on the NCE trading post.
Lets take my Tribemeet gang as an example...
We have guys armed with claws for hands, weird mechanicus weapons and some pretty large dudes... yet I managed to fit them all into a standard NCE Van-Saar gang. The Juves counted their clawed / tentacled hands as knives. The Magos was just a leader with Plasma Gun, Autogun and Sword. The gangers have weird mechanicus weapons which count as Autoguns and Hunting Rifles. One of the heavies looks like he has some kind of Reaper Autocannon... which counted as a Heavy Stubber..
Point being, there is actually no need for us to actually suggest any of this in any official capacity and players can just use whatever fits the look of the minis. The only weapons we need to really look at are ones which have absolutely no usable substitution in NCE such as the Harpoon Gun and Grav Gun (although the Grav Gun could be used as a Plasma Gun, I quite like the idea of adding them in, even if as a rare item).