You should be able to see all the formulas. I can see them as an unregistered user. If you want to see highlighted cells and change the grey-boxed values, you'll need to download the spreadsheet.
Your question isn't comparing apples and oranges because you'd need a fully-leveled set of weapons of the off-element for the comparison. In general, your focus element will have the highest level weapons and thus the highest base attack power. My spreadsheet just tells you damage modifiers and assumes the base attack power between each comparison is the same (that you're using the same weapon grid in each case). It's possible to do a comparison with different base attack values, but it'd add complexity to the calculations.
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I added a base attack value factor to the comparison. You can input the average attack values of the 5 members into the grey boxes for each team and explore the simulated differences in damage between different weapon grids.





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