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OK, tried to match the advice in the Luxcore Wiki SSS page some more, but when I leave both the Glossy Translucent material's Transmission color and the Volume's Scattering value white, colors become very faint, and the bump map starts looking like artifacts: Happy Halloween by Metin Seven - Luxcore...

Have you read this? https://wiki.luxcorerender.org/Subsurface_Scattering It explains some of the fundamental principles of using SSS in LuxCore. I used Random Walk SSS in Cycles, which is the same algorithm as LuxCore uses, unless I'm mistaking. This is correct. Slightly closer again, using a Heter...

OK, adjusted the light strength of both the HDRI environment as well as the direct lights to get more light energy going and match the Cycles scene more.

It looks a bit brighter now, but still not the nice light falloff inside the volumes.

I'm using the same HDRI with the same orientation. Luxcore's diffuse shader gives a very different result on the background, hence the visible difference. But if you focus on the pumpkin you see similar brightness. Nonetheless, I'll change some light settings to see if that really changes the SSS ef...

But I seem to remember one of the Luxcore devs confirming my question if Luxcore uses Random Walk SSS.

Slightly closer again, using a Heterogeneous Volume now, and turned down Glossy Translucent material transparency a bit further... Nodes:

Another slight improvement. Turned on Multiscattering in the new node setup.

New rendering: Node setup for the soft yellow material:

Experimented some more.

I managed to get a bit more visible SSS light falloff inside the pumpkin, but still not the glowy liquid SSS of Cycles.

New Luxcore rendering: New node setup for the soft yellow parts:

Hi, I've rendered a scene using LuxCore and Cycles, and although I like LuxCore's shaders, lighting and shadows better, to me Cycles wins in the SSS area. I used Random Walk SSS in Cycles, which is the same algorithm as LuxCore uses, unless I'm mistaking. LuxCoreRender version: Happy Halloween by Me...

Thanks for sharing. Interesting!