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I'd like to compare 2 or more near-infrared spectra. The data consists of measured light intensity in different wavelengths (range 600 nm to 1100 nm).

I'm wondering which statistical method would be appropriate? I noticed when searching online that pearson correlation might be inaccurate as it's used for linear correlation. However, when experimenting with MATLAB's function corrcoef, I get pretty accurate results when comparing visually spectra. But still unsure if some other method would be better in this case so thoughts on the matter would be highly appreciated, thanks!

Attached example of the data to be compared.

I'm wondering which statistical method would be appropriate? I noticed when searching online that pearson correlation might be inaccurate as it's used for linear correlation. However, when experimenting with MATLAB's function corrcoef, I get pretty accurate results when comparing visually spectra. But still unsure if some other method would be better in this case so thoughts on the matter would be highly appreciated, thanks!

Attached example of the data to be compared.