AFAIKT Google's recruitment for SWE and SRE (system engineer ladder) are separate. If you did not pass the SWE interview, ask the recruiter if you can do an SRE interview. Hope this helps!
Source: I went the process of failing the SWE interview but got an offer as an SRE.
Source: I went the process of failing the SWE interview but got an offer as an SRE.