Yes. Blaze is the name of the binary inside Google. 90% of the code is in common. Differences are 1. integration with Google-internal tools, and 2. legacy misfeatures we plan to remove.
What kind of internal integrations, if I may ask? Does it automatically deploy code for you on a successful build or something like that?
For example, blaze has integration with Google's build cache. Most of the time it takes 0 seconds to compile a given file, when someone else has compiled it before with the exactly same contents, dependencies and compiler flags.