If all the old eastern cities had their sewer systems rebuilt and utilities located to the same uniformly built and documented standards as newer western cities, these comparisons would be fair.
It makes a big difference when there are giant underground tunnels with plenty of space for new pipes, wires, conduit, compared to a spaghetti patchwork. 20 Layers of asphalt, concrete, tarmac, 2-3 kinds of cobble/granite/limestone/bluestone, rubble, and then misc. soil intertwining the patchwork of utilities doesn't help either. Nor does having all the paperwork and drawings for all of that scattered in a hundred places in various formats.