Comparing audio changes at matched levels

[LucasKi]

For an exploration prototype, I am preparing a short music loop for one room. The repeat point is more noticeable than I expected during extended listening. I need to distinguish a poor loop boundary from a sound already present in the export. A comparison between two crossfade lengths seems like a sensible starting point. Each version would use the same level and the same unaltered middle section. There is no dramatic change in the room at the repeat point, so the music should not imply one. I would listen to several cycles in context, then inspect the boundary separately, keeping notes about exactly when the interruption becomes apparent. A page about remove suno artifacts came up during my search for another possible check. I do not have a processed example and cannot say whether it addresses this issue. The priority is an unobtrusive repeat that preserves the mood of the room. Which checks would you make before changing the exported audio itself?