no one to help here? So I try...
240VAC tolerant switching power supplies normally (!) have no problems with 100 VAC. Vice versa is a lot more difficult: Board layout and all primary components have to stand much more voltage, i.e. rectifiers, primary capacitors, isolation, air gaps ... This is not only a question if the components can handle 350 VDC, but also a question of safety. I remember SONOS-like components sold from China in Europa, which I NEVER would use due to unsufficient gaps between conductors.
All this I cannot verify on your picture. For a first idea, look at the values printed on the big capacitor. It should accept at least 350, better 400V. If not so, forget any affords and look for another power supply...