Hey there. You can use other weapons, you do not need the originals. Those do count if you have them. Gambit weapons - so Bygones, Hazard of the Cast, Bad Omens, Gambit Prime weapons - Gnawing Hunger, Night Watch, Lonesome, Malfesance works too if you want to use that. For newer weapons, you can use Borrowed Time, Trinary System, Servant Leader, Bottom Dollar, Crowd Pleaser, and Herod-C. That is as far as the 'pool' of allowed weapons has been updated. Weapons that do not work - Dead Weight, Yesteryear, Albruna-D, and quite likely, the current reissued version of Trust. Also do not work - old Gambit rituals/pinnacles like Hush, Python, and Breakneck.