The modern International System of Units (SI) was originally created as a formalization of the MKS system, and although the SI has been redefined several times since then and is now based entirely on fundamental physical constants, it still closely approximates the original MKS system for most practical purposes.
Despite numerous revisions, the modern International System of Units (SI) closely follows the principles of the original MKS system for everyday applications, even though it is now grounded in fundamental physical constants.