Filement is 1.75 on both, in fact same exact spool. .40 noddle on both. After installing the Bulldog I reset the steps to what the bulldog recommended then did a calibration to make sure it was correct. Different heater cartridges and thermistors, latter have similar specs but the heater cartrige/resistors are different, 3W vs 30W.

Not so concerned about 225 being the same one both, guessing they are close but not spot on. Just curious if others had to run their Hexagon hotter then the JHead.