Although both pistols are from the same manufacturer and share the same characteristics, there's a slight change in aligment, hence the two versions.
It replaces the piece at the end of the barrel. 3 seconds to swap on the R27 but it takes a bit longer on the R32 because you need to unscrew the spring guide.
It should, in theory, be compatible with other branded 1911s but I can't assure a perfect aligment.
If you end up printing one, either post a make or comment with the results. I'll update the description with a compatibility list.
The author hasn't provided the model origin yet.