…Because there is a difference; and it’s a big one.
(Incidentally not the one I thought–but a difference nonetheless)
Both scanned the SAME way in Vuescan Professional, using no sharpening or dust correction. Three passes with Multi-Exposure, no enhancement present, 2650 DPI.
Dust spotted, and processed to taste in LR 5.7.1 (WB, crop adjustment, tone)
Exported to JPG, and posted here for your perusal.
EDIT: The upper scan was with the Opticfilm 120; the lower with the flatbed Epson V600. For comparison purposes, here is the same scan with the Opticfilm, using Silverfast as intended