Yes, though it's also worth remembering that while most carbonates are biotic to some degree or another, there are abiotic sedimentary carbonates that can form in specific chemical environments and rare igenous carbonates (i.e., carbonatites), so we would want to be careful with a blanket assumption that carbonates = life and thus are wholly unique to a planet that has or had life. Though, certainly something like a bioclastic limestone would be unique to a planet that had life.