That's a difference of 10nF and 10mOhm, that will be well within the tolerance of most meters. That does strike me as very low impedance though, for an electrolytic capacitor I would expect an ESR that is a sizable fraction of an Ohm. Have you tested that one with an Ohm meter rather than an ESR meter? The DC resistance should briefly show low ohms, then quickly rise to a nearly open circuit. One fault of an ESR meter is that from its perspective, a capacitor with a very low ESR looks the same as one that is shorted.