It's quite possible that it is a Nitrolit loaded bomb - the question remains which bomb.
However the legend of the bomb in the Nowegian museum mention a central firing pipe tube that is consistent with a fire bomb
Fusse - the Michlastbehalter 250 was definitively different and it was only an external envelope into which one could put various stuff, including small cylinders containing liquids - but it was impossible to fill it directly. And the tail unit was completely different.
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The Swedish Flyvapnet used already in 1942 a drop container but it was rather different:
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Blockhaj, would you have a drawing and dimensions of this container?