The 48202 G3 and 23055 Supernova2 threads are 1-1/2 x 8 UNC ( UNIFIED COARSE). The threads have a 60 degree pitch and are flat on top. 

The Powermatic threads are 1-1/2 x 8 BSP (BRITISH STANDARD PIPE).  The Powermatic threads have a 55 degree pitch and are rounded on top.

We do not have an adapter for it. Two adapters (step down, step up)  invites problems for runout and wobble.

We still haven't been able to confirm what the Conover is, except that it is 1-1/2" x 8 and a G3 only mounts for one or two turns.