 Most membranes have roughly this thickness but not all. There is a bit of a tendency, so first this is hard to determine and we don't know this exactly. But if you look at different organisms, to first approximation they have roughly similar membrane thicknesses, again ballpark of 30 angstrom in the 25 maybe in the hydrophobic region. If we look inside a cell though there appears to be some slight differences where the endoplasmic reticulum in particular, the first membrane where we create proteins, the protein factory in their cells, appears to be slightly thinner and then there is some sort of tendency all the way out to the plasma membrane around our cells which is slightly thicker. I would take this with a grain of salt. There are other studies that somewhat contradict this but in theory at least if there is a systematic difference between the thickness of the membrane cells might be able to use that as a way to sort proteins so that thin proteins that are not alpha helices that are not so long for instance they would go into thin membranes while longer alpha helices would go in the thicker membranes.