<sigh> No.
The delta variant includes several mutations that affect the spike protein, which is a large part of the reason why it is moderately vaccine resistant. This is precisely what I said. A change to the spike protein can result in a reduction in vaccine effectiveness, but not all mutations affect the spike protein (and not all mutations that affect the spike protein will make it more resistant, either).
<sigh> Again, no.
While the mRNA vaccines differ in how they introduce the spike proteins to the host's bloodstream to prompt an immune response, EVERY SINGLE APPROVED COVID VACCINE tagets the spike proteins, though with different delivery. The virus vector vaccines use a modified adenovirus to hijack your body into making the mRNA which then causes the spike proteins to be produced. This includes Sputnik, too. The mRNA vaccines just cut out the middleman. Coronavac is slightly different in that it uses the whole virus, instead of just the spike protein, but the process in which the virus is rendered inert leaves the proteins alone, so the immune system still fixates on the spike protein.