This depends on how we define a language.
Ada 2012, for instance, is a significant update to Ada proper (better integrated support for design by contract, among other things). The next iteration (and its SPARK subset) is potentially closing some of the gap between Ada and Rust in the areas where Rust is presently "safer" (by some measure, here primarily memory safety) than Ada.
C++20 versus C++98 (what I initially learned) is a very different language (or has the potential to be) thanks to its greatly expanded support for certain modes of programming that C++98 did not offer. But its differences with C++17 are a lot smaller, so they're more obviously "the same" language.
