The name of the package SUNWj3dem (Java3D demo) bundled with Solaris 8 9/00 CD is the same of the package of j2se 1.3RC demo programs

% pkginfo | grep SUNWj3
application SUNWj3dem Java3D demo programs
system SUNWj3dem.2 JDK 1.3 demo programs
system SUNWj3dev JDK 1.3 development tools
application SUNWj3doc Java3D API Documentation
system SUNWj3drt Java3D Runtime Environment
system SUNWj3dut Java3D Utilities Source
system SUNWj3man JDK 1.3 man pages
system SUNWj3rt JDK 1.3 run time environment

% pkginfo -l SUNWj3dem
   PKGINST: SUNWj3dem
      NAME: Java3D demo programs
  CATEGORY: application
      ARCH: sparc
   VERSION: 1.1.2,REV=1999.08.23
   BASEDIR: /usr
    VENDOR: Sun Microsystems, Inc.
      DESC: Demonstration applications and applets
    PSTAMP: bastet19990823105625
  INSTDATE: Jun 27 2000 18:48
   HOTLINE: Please contact your local service provider
    STATUS: completely installed
     FILES: 249 installed pathnames
                 3 shared pathnames
                34 directories
              4518 blocks used (approx)

% pkginfo -l SUNWj3dem.2
   PKGINST: SUNWj3dem.2
      NAME: JDK 1.3 demo programs
  CATEGORY: system
      ARCH: sparc
   VERSION: 1.3.0,REV=2000.08.03.22.31
   BASEDIR: /usr
    VENDOR: Sun Microsystems, Inc.
      DESC: Demonstration applications and applets
    PSTAMP: hotvmm03223213
  INSTDATE: Sep 07 2000 19:59
   HOTLINE: Please contact your local service provider
    STATUS: completely installed
     FILES: 634 installed pathnames
                 1 shared pathnames
               101 directories
                 1 executables
             10936 blocks used (approx)

% more /etc/release
                       Solaris 8 9/00 s28s_u2wos_03a SPARC
           Copyright 2000 Sun Microsystems, Inc. All Rights Reserved.
                              Assembled 15 May 2000

There are no installation problems, even if they use the same BASEDIR, because they use different installation directories:
- j2se demo in /usr/demo/J2SE/demo
- java3d demo in /usr/demo/JAVA1.2/demo/java3d
pkgadd will generate a .2 package for the last package installed
Then if someone would like to remove the packages of j2se 1.3 he could make a mistake if java3d demo has been installed before
In the README.sparc file the name of the package is always SUNWj3dem, no mention to check if this is the right one.