pin Quite a few, yes. I only tested this in a messy VM just now, though.
Here's the output of pkgin show-full-deps (pkgin on 9.0_current)
full dependency tree for libreoffice6-bin-6.2.8
        suse_libffi-13.1{,nb*}
        pcre>=8.30nb1
        libuuid>=2.18
        libffi>=3.3nb1
        python38>=3.8.0
        glib2>=2.64.0nb1
        suse_libdrm-13.1{,nb*}
        suse_expat-13.1{,nb*}
        suse_libxml2-13.1{,nb*}
        suse_libtiff-13.1{,nb*}
        suse_libjpeg-13.1{,nb*}
        suse_glib2-13.1{,nb*}
        suse_openssl-13.1{,nb*}
        suse_base-13.1{,nb*}
        suse_x11>=13.1<13.2
        suse_qt4>=13.1<13.2
        suse_locale>=13.1<13.2
        suse_libpng>=13.1<13.2
        suse_libdbus>=13.1<13.2
        suse_libcups>=13.1<13.2
        suse_krb5>=13.1<13.2
        suse_gtk2>=13.1<13.2
        suse_gstreamer>=13.1<13.2
        suse_glx>=13.1<13.2
        suse_freetype2>=13.1<13.2
        suse_fontconfig>=13.1<13.2
        suse_dbus-glib>=13.1<13.2
        suse_avahi>=13.1<13.2
        desktop-file-utils>=0.10nb1
And for libreoffice:
full dependency tree for libreoffice-7.1.1.2nb1
        ttmkfdir2>=20021109
        p11-kit>=0.23.15nb1
        nettle>=3.6
        mozilla-rootcerts-[0-9]*
        libtasn1>=4.9
        libcfg+>=0.6.2nb3
        jbigkit>=2.0
        at-spi2-core>=2.35.1nb1
        py38-cElementTree-[0-9]*
        gsed>=3.0.2
        lzo>=2.01
        gcc7>=7.0
        nghttp2>=1.40.0nb4
        libidn2>=2.0.0
        jpeg>=9
        pinentry-[0-9]*
        npth>=1.2
        libusb1>=1.0.9
        libksba>=1.3.4
        libgpg-error>=1.28
        libassuan>=2.4.2
        orc>=0.4.6
        gobject-introspection>=1.62.0nb1
        check>=0.9.5
        wayland-protocols>=1.17
        wayland>=1.17.0nb5
        libxkbcommon>=0.4.0nb1
        fribidi>=0.19.1
        atk>=2.33.3nb1
        at-spi2-atk>=2.34.1nb1
        tiff>=4.0.3nb5
        libunistring>=0.9.4
        libpaper>=1.1.22
        pango>=1.44.7nb3
        gdk-pixbuf2>=2.40.0nb1
        cairo-gobject>=1.16.0nb5
        xmlcatmgr>=2.0beta1
        libgcrypt>=1.6.0
        lz4>=1.7.3<100
        libevent>=2.1.11nb1
So it seems to me that version 7 is "native" while version 6 is a Linux build?
  
It's the libreoffice package that looks quite "retro". The libreoffice6-bin one looks like plain old gtk2 but doesn't take notice of any gtk themes. So they both look sort of... dull. 😅
NB: For what it's worth, I did enable Linux emulation in /etc/fstab(procfs, tmpfs etc.) but I admit I'm sort of new to this and still have some research to do...