No plugin binaries are ever packaged into a .qtz file. Never.
What you maybe confusing is that LV2 plugins are identified by a system location agnostic URI and all others by a file-system path (where they reside when installed).
now, you'll certainly need to have the same plugins installed on the target system if LV2; for all other types but LV2 you'll need to have plugins on the exact and very same file-system location path on the target computer. Otherwise they won't get found and loaded, obviously.
No plugin binaries are ever packaged into a .qtz file. Never.
What you maybe confusing is that LV2 plugins are identified by a system location agnostic URI and all others by a file-system path (where they reside when installed).
now, you'll certainly need to have the same plugins installed on the target system if LV2; for all other types but LV2 you'll need to have plugins on the exact and very same file-system location path on the target computer. Otherwise they won't get found and loaded, obviously.
Is that clear?