Sorry but that doesn't quite make sense, either it is a rebadged iron and the tips are intercompatible or it's entirely different threading and therefor not the same iron at all really.

But if they are similar enough have you looked into possibly getting a replacement end-insert so you can accept the more common tips?

Also I recently bought one http://www.amazon.com/Weller-P2C-Butane-Soldering-Iron/dp/B000B61L0G/ they are pretty cheap now-a-days!