Same applies to Concorde and the TU144. The latter was dubbed 'Concordski' by the press inferring it was a Concorde copy. Shows what the press know!
A supersonic airliner requires a thin fuselage and highly swept thin delta wings, hence the superficial likeness of the two designs. However, there are two bits on Concorde that made it work as well as it did; the wing and the intakes (including the intake control system).
If the Russians had managed to copy those they would have had a winner on their hands!