[Ifeffit] Collected k-space and fitting range

Hello, I am a bit confused about the range of k-space, which may affect the quality of EXAFS fitting. I would like to understand whether there is a difference between the fitting using an identical fitting range of k-space obtained from different range of k-space collected. For example, is there a notable difference between a fitting of k = 2.3-11 which was deduced from a spectra data collected up to k=12 and a spectra data collected up to k=13 ? Kind regardsTerry