Just a heads-up the Lotus bowl fits in the Imp/Impcog and works MUCH better than anything else i've tried, MUCH bigger bowl, better airflow, less hotspots, and i feel like it adds a bit of conduction
Inner diameter yes, OD is much more important for a male piece like this, the OD's identical, try it yourself if you dont believe me, using it now ¯\_(ツ)_/¯