Perhaps you do not know that the title of your question already contains an important key to interpret IR-spectra: not only to inspect rather small, isolated regions of the spectrum, but to see the spectrum as a whole. By doing so, you have to watch out for additional absorption bands that were equally providing evidence for one, or the other structure; by scrutinizing both the position ($\tilde\nu$), shape, and relative intensity of the absorption bands in question.
As an example: is there evidence for a carbonyl group, indicative for the acid?
Why? Because -- depending on the mode of data collection (e.g., transmission in a matrix of a KBr pellet, or neat film by ATR) the shape of the spectra recorded may differ. In contrast to 1H NMR, IR offers you a view on structural elements .and. the whole molecule. Then, indeed, IR spectroscopy may offer much insight.
P.S.: From the baseline of the spectra shown it is likely the data were recorded on a ATR-FT-IR spectrometer. If you look into the data recorded, you will find each point is typically about 0.43 wavenumbers a part from the next one. Hence it may be more sound to perform the "peak pic" / stating the barycentre of the absorption bands only by whole wavenumbers, without two digits behind the decimal point (significant figures).