Anyone know if a reg for FX wildcat fits into a taipan veteran?

I have a huma reg for a wildcat which I do not use, and wondered if it would fit into the tube of my veteran? I measured the OD`s of both tube, and the OD of the taipan is 2mm bigger. But it is the ID which matter, so if anyone know the ID of the taipan tube, it might be helpfull also. I might be tempted to use it at one time, to try out different tunes, if it would fit.