German Measles is Rubella. Measles, also known as Rubeola while also an RNA virus, is caused by a distinctly different virus from Rubella.
Rubella is not a “variant” of Measles nor is Roseola (often confused with Measles and or Rubella but caused by a Herpes virus for which there is no vaccine), although many of the symptoms are similar. Because Measles and Rubella are caused by entirely different viruses, that is why there are two different vaccines for them, since the early 70’s combined in the MMR (Measles/Mumps/Rubella) vax.
Depending on when you were vaccinated for Measles (that vax first came out in 1963), you may not have been vaccinated for Rubella.
Rubella is less contagious than Measles and is a typically a milder disease but can cause serious birth defects or miscarriage when contracted by a pregnant mother. Measles on the other hand is highly contagious and can be more serious, prone to more serious complications in both children and adults.
If you were vaccinated for Measles but not also for Rubella, then you didn’t contract a “variant” of Measles, you contracted Rubella.
Thanks for the education..