They are different, in completely different Families.
Wax Myrtle, genus Myrica, Family Myricaceae
Common Myrtle, genus Myrtus, Family Myrtaceae
Common Myrtle is a commonly grown plant in California.
These are some of the 'types' that are common in America:
Myrica californica; Myrica cerifera; Myrica gale; Myrica hartwegii;
Myrica heterophylla; Myrica inodora; Myrica pensylvanica. If you do a
search, you will find some(all) of them in the UK.
That I don't know. But I would think that you could find one of those
mentioned by told2b. Many native California plants are happy in the UK
(Fremontia, Ceanothus, CA Poppies) so maybe the Wax Myrtle is also.
Hope you can find one of them.
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