Hi tdf-texas,
It’s always best to go directly to the manufacturer for a suggestion on which of your options are best for you because they have much more detailed knowledge of all the materials in their mattresses and a database of customers of all different heights, weights, and sleeping positions which they can use as a reference point. Their suggestions will be much more valuable than any “theory at a distance” I could offer because they are much more familiar with how the specific combinations of materials in their mattresses interact with different people. The only other reliable indicator would be personal testing of similar mattress that may be available locally that you can use as a reference point
If I was in your shoes though with such a difference in weight I would strongly consider changing your order to the Eurotop version because you can exchange the layers if you need to for a reasonable cost and you can also order a side to side split layering which may help with the weight difference between you. You can read more about this in post #2 here.
Phoenix