pkgsrc.tar vs pkgsrc-2020Q1.tar

[Sad Clouds <cryintothebluesky%gmail.com@localhost>]

Hi, what is the difference between various pkgsrc tar files on the ftp
site? Some were uploaded on March 31, some on Apr 18. Is this to do with
bug fixes which go into pkgsrc.tar vs pkgsrc-2020Q1.tar? So if I get
pkgsrc.tar.bz2 from this folder, I'm not getting pkgsrc-current, I'm
getting stable pkgsrc-2020Q1 with selected bug fixes, is this correct?

ftp> pwd
257 "/pub/pkgsrc/pkgsrc-2020Q1" is the current directory.
ftp> ls -l
200 PORT command successful.
150 Opening ASCII mode data connection for '/bin/ls'.
total 608308
drwxrwxr-x  52 600  netbsd      2048 Apr 18 02:36 pkgsrc
-rw-r--r--   1 600  netbsd  47695206 Mar 31 04:51 pkgsrc-2020Q1.tar.bz2
-rw-r--r--   1 600  netbsd        63 Mar 31 04:51 pkgsrc-2020Q1.tar.bz2.MD5
-rw-r--r--   1 600  netbsd        72 Mar 31 04:51 pkgsrc-2020Q1.tar.bz2.SHA1
-rw-r--r--   1 600  netbsd  63731902 Mar 31 04:51 pkgsrc-2020Q1.tar.gz
-rw-r--r--   1 600  netbsd        62 Mar 31 04:51 pkgsrc-2020Q1.tar.gz.MD5
-rw-r--r--   1 600  netbsd        71 Mar 31 04:51 pkgsrc-2020Q1.tar.gz.SHA1
-rw-r--r--   1 600  netbsd  42507232 Mar 31 04:51 pkgsrc-2020Q1.tar.xz
-rw-r--r--   1 600  netbsd        62 Mar 31 04:51 pkgsrc-2020Q1.tar.xz.MD5
-rw-r--r--   1 600  netbsd        71 Mar 31 04:51 pkgsrc-2020Q1.tar.xz.SHA1
-rw-rw-r--   1 600  netbsd  49336873 Apr 18 02:38 pkgsrc.tar.bz2
-rw-r--r--   1 600  netbsd        56 Apr 18 02:38 pkgsrc.tar.bz2.MD5
-rw-r--r--   1 600  netbsd        65 Apr 18 02:38 pkgsrc.tar.bz2.SHA1
-rw-rw-r--   1 600  netbsd  64822605 Apr 18 02:37 pkgsrc.tar.gz
-rw-r--r--   1 600  netbsd        55 Apr 18 02:37 pkgsrc.tar.gz.MD5
-rw-r--r--   1 600  netbsd        64 Apr 18 02:37 pkgsrc.tar.gz.SHA1
-rw-rw-r--   1 600  netbsd  42980304 Apr 18 02:41 pkgsrc.tar.xz
-rw-r--r--   1 600  netbsd        55 Apr 18 02:41 pkgsrc.tar.xz.MD5
-rw-r--r--   1 600  netbsd        64 Apr 18 02:42 pkgsrc.tar.xz.SHA1
lrwxr-xr-x   1 600  netbsd        14 Mar 31 04:51 pkgsrc.tbz -> pkgsrc.tar.bz2
lrwxr-xr-x   1 600  netbsd        13 Mar 31 04:51 pkgsrc.tgz -> pkgsrc.tar.gz
lrwxr-xr-x   1 600  netbsd        13 Mar 31 04:51 pkgsrc.txz -> pkgsrc.tar.xz