FWIW I've used TFX-2 with TMX; EI, CI, curve shape, graininess and acutance are identical to Rodinal 1:100.(posted 8648 days ago)Or to put it differently, with TMX at least it gives higher acutance and slightly more graininess than D-76H 1:1, with a slight shouldering on the high end. I'd expect about the same with Neopan.
Supposedly TFX-2 is an "improved" version of FX-2 for t-grain type films. Here's a tidbit from Anchell & Troop; "Crawley suggests Pinacryptol should not be added to FX-2 when developing tabular grain films."
That's probably the difference.