[member="Kerrel Di Marzullo"]
There's a few different canon sources, and only one source explicitely states the difference between the Havoc and the rest of the Scurrg prototypes - although its only a half-truth. The tabletop game included the bomblet generator as part of the gameplay mechanics for diversity and to let the player use their own version of the Havoc, to show the modularity of the ship and the fact that the bomblet generator was capable of being attached to other ships as well. The prime difference between the Havoc's bomblet generator and that of the rest of the prototypes was that Nym's ship was tampered with to great success in order to take advantage of the "unstable" bomblet generator. Whereas a normal bomblet generator (there are several other ships in past Star Wars starfighter games which include a knock-off or something similar to this weapon) would have a normally limited amount of shots, Nym's generator was made to produce a theoretically unending supply of ammunition. In reality this doesn't really make it all that special, albeit unique with a nice perk. If you want to replicate this it will take a substantial amount of development, as finding the canonical ship would still require substantial development behind both finding and repairing it.
tl;dr:
It would be theoretically possible to have another ship with this generator, but its going to take quite the amount of development.