I found some papers [n] about this. And I think the answer is yes, the format matters asnd hence the representation.

I wonder if the author would be willing to try with another representation.

[1]: Does Prompt Formatting Have Any Impact on LLM Performance? https://arxiv.org/html/2411.10541v1

[2]: Large Language Models(LLMs) on Tabular Data: Prediction, Generation, and Understanding - A Survey https://arxiv.org/html/2402.17944v2