Brawn and Huffer are completely different.
Brawn:
Huffer:
Toys using the same mould in Generation 1 would be:
Smokescreen / Prowl / Bluestreak
Gears / Swerve
Outback / Brawn
Huffer / Pipes (mostly)
Starscream / Thrust / Dirge / Ramjet / Thundercracker / Skywarp
Cliffjumper / Hubcap (mostly)
Ratchet / Ironhide
Spyglass / Spectro