Differentiating between Kurdjumov-Sachs (K-S) orientation relationship variant pairs in martensite/bainite transformations is indeed quite challenging due to the similarities in their misorientations and close-packed planes. As you pointed out, both V1/V2 and V1/V3 variant pairs share similar characteristics, which makes them hard to distinguish solely based on pole figures.

However, while pole figures are useful for visualizing the texture, they may not provide all the necessary details for distinguishing between variant pairs. More precise techniques might be required to distinguish between these variant pairs, which could include:

Remember that distinguishing between similar variant pairs is complex, and no single technique may provide a complete answer. It might require combining multiple techniques and careful interpretation of the results.

Given the advanced level of your question, I'd also strongly suggest reaching out to your academic advisor or other specialists in your department. They might be able to provide more specific guidance based on your exact experimental setup and the resources available to you.

Additionally, you may want to refer to the following literature for more detailed information:

Remember to analyze your results critically and consider all possibilities in your analysis. Good luck with your research!

https://mtex-toolbox.github.io/

https://mtex-toolbox.github.io/ParentChildVariants.html

If you have access to Matlab, check the MTEX toolbox. You can simulate your variants and check it visually.