<p>Limestone has been used in architectural heritage for centuries due to its wide availability and ease of extraction, particularly in France. The historical city of Langres (Eastern France) is largely built from a local limestone called <i>Pierre de Langres</i>, a crinoidal limestone exhibiting variability in crinoid content, cement composition, and matrix characteristics. This study aims to characterize the petrological and petrophysical diversity of this stone and evaluate the performance of a commercially available substitute, <i>Pierre de Pouillenay</i>, employed for restoration purposes due to the cessation of quarrying activities in Langres. Petrographic analyses identified three subfacies of <i>Pierre de Langres</i>, differentiated by crinoid abundance, cement/matrix characteristics, including carbonate cements locally stained by iron oxides/oxy-hydroxides, and porosity. Petrophysical testing revealed variations in pore structure, capillary water uptake, ultrasonic wave velocity, and mechanical strength across subfacies. Durability assessments under simulated hygrothermal conditions typical of Langres (wet-dry cycles and thermal shocks) indicated that while all stones underwent minor changes, the extent of porosity loss, microcracking, and grain rearrangement varied according to mineralogical composition and internal texture. Among the findings, <i>Pierre de Pouillenay</i> demonstrated high compatibility, physically and aesthetically, with one of the Langres subfacies, making it a suitable replacement in this context. For a second subfacies, its use may be acceptable in terms of mechanical properties, though colour differences are more evident. However, for the third and most porous subfacies, discrepancies in colour, porosity, and thermal response suggest that <i>Pierre de Pouillenay</i> is not an appropriate replacement.</p>