Do I earn the same Miles Accelerator bonus if I have purchased a Skywards Flex or Skywards Saver fare?

Yes, any Skywards Miles you earn by opting in to Miles Accelerator are the same whether you buy a Skywards Flex or Skywards Saver ticket.

Related questions

What are the differences between 'Skywards Flex' and 'Skywards Saver' fares?
Why should I buy a Skywards Flex fare when a cheaper Skywards Saver fare is available?
How do I identify a Skywards Flex or Skywards Saver fare before I purchase a ticket?