A1: yes, you can. due to numerical error, their neff is slightly different;
A2: For TE fraction, please refer this page: https://support.lumerical.com/hc/en-us/articles/360034396734-FDE-solver-analysis-Mode-List-and-Deck
BTW: I also refer you to this post: Ansys Insight: 有关TE、TM模式以及模式光源的问题
For for contrast waveguide, traditional definition may not well fit. So please check the dominant field component.
A3: it is not wrong. In this case, you should not count the mode number to determine if it is TE or TM. You should check the dominant field component instead. When symmetry BC is used, it will suppress the other polarization. Once you get more information from #2, you will know why.
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