Are yarn pnp and pnpm similar?

[bestseob93]

Hi, thanks for your works.

While comparing pnpm and pnp, a question arose.
.pnp.cjs's "packageRegistryData" and .pnpmfolder structure look similar.

is there any difference except hard/symlink and zip archive?

[arcanis]

There are a few other differences, the main one imo being that pnpm-style installs still use the filesystem, and as a result cannot perfectly install all dependency trees (cf this comment).

[bestseob93]

Thanks @arcanis :)
so, Is the strategy to prevent duplicate instantiation the similar?