The volume shader of the Luxcore renderer and the Cycle renderer, as well as the calculation of the spread angle of the light and the calculation of the energy of the light, are slightly different. I can only do my best to get their results as close as possible.
Path guiding 4.5h (6000 samples)+0.5h（30000 samples for a small area）:
Luxcore 19min bidir+metropolis+photonGI caustic cache:
For Cycle, I tried to sample the blue and violet light better in the lower right area, so the lower right was sampled an extra 30,000 times, but unfortunately not much improvement. Similarly, for the purple light region of dispersive light, path guiding also encountered difficulties in sampling, resulting in a shorter purple light length than the result of the Luxcore renderer. But for Cycle, such a result is already incredible!