No need to wait - the hyperspace fuel equation enables us to see how the ships' jump ranges change as a function of mass.
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In the graph above, both ships are assumed to have an A-rated, fully engineered SCO FSD. At x=0, both ships are in one-jump wonder configuration - all modules selected and engineered to be as light as possible, a class 5 Guardian FSD booster, no non-essential modules, and fuelling equal to each drive's maximum fuel per jump (ie enough for one maximum range jump). Reserve fuel assumed negligible. As we proceed along the x-axis, we can see how their jump range decreases as we add mass.
The Mandalay takes the crown at 91.53LY vs 90.96LY. But we can see that the crossover point occurs at just 5 tons extra. After that, the Anaconda has greater range. If we allow legacy modules into the equation it is even closer. With my 6A v1 FSD and Engineers 1.0 lightweight sensors, I can push my Anaconda to 91.50LY. The Mandalay still just shades it, but the ranking switches with just 1 ton more mass. I'll try and post the maths in more detail, but basically this is due to the Anaconda being heavier - any increase in mass is a smaller proportion of the total compared to the Mandalay, so its jump range falls away more slowly. The combination of a 400T base hull and a class 6 FSD is hard to beat.