Both versions return the same results:
ubuntu@creation-test-amd64-1:~$ (apt-cache showsrc e2fsprogs 3>&1 1>&2 2>&3
3>&- | grep -v ^W: ) 3>&1 1>&2 2>&3 3>&- | awk '/^Package-List:/ { show=1; next
} (/^ / && show==1) { print $1 ":*"; next } { show=0 }' | sort -u | tr '\\n' ' '
comerr-dev:*
e2fsck-static:*
e2fsprogs-l10 :*
e2fsprogs-udeb:*
e2fsprogs:*
fuse2fs:*
libcom-err2:*
libext2fs-dev:*
libext2fs2:*
libss2:*
logsave:*
ss-dev:*
ubuntu@creation-test-amd64-1:~$ apt-cache showsrc e2fsprogs 2>&1 | grep -v ^W:
| awk '/^Package-List:/ { show=1; next } (/^ / && show==1) { print $1 ":*";
next } { show=0 }' | sort -u | tr '\\n' ' '
comerr-dev:*
e2fsck-static:*
e2fsprogs-l10 :*
e2fsprogs-udeb:*
e2fsprogs:*
fuse2fs:*
libcom-err2:*
libext2fs-dev:*
libext2fs2:*
libss2:*
logsave:*
ss-dev:*
--
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