I think the following is the information you are looking for:

"Each /package/ may specify a simple package name, such as guile, optionally followed by 
an at-sign and version number, such as guile@3.0.7 or simply guile@3.0. In the latter case, 
the newest version prefixed by 3.0 is selected.”

It comes from the documentation at https://guix.gnu.org/manual/en/html_node/Invoking-guix-package.html[1].  Admitedly, it is not easy to find if you don’t already know what you 
are looking for.

On Friday, June 2, 2023 11:48:45 AM MST Rodrigo Morales wrote:
> The /gnu/store of my system contains two versions (1.1.1 and 1.2.1) of
> Inkscape that are already built (see last two lines below)
> 
> ,----
> 
> | find /gnu/store -mindepth 1 -maxdepth 1 -name '*inkscape*' -exec du
> 
> -hs {} + | sort -h
> `----
> 
> ,----
> 
> | 4.0K   
> | /gnu/store/500rmmh2b0m4abmhs3pv5888kfj7jmdh-inkscape-1.2.1.tar.xz.drv
> | 4.0K   
> | /gnu/store/b4zacwzx5lriwxrpr7y4wi1i3rl22ybx-inkscape-poppler-compat.patch
> | 4.0K   
> | /gnu/store/g46dzii7g1ffi7iz1mkqydkh5filn93j-inkscape-1.2.1.tar.xz.drv
> | 4.0K   
> | /gnu/store/jkpfxya83dzkyl42wawd8avvwvh1rjbv-inkscape-1.2.1.tar.xz.drv
> | 4.0K    /gnu/store/ppnajjk1jmp59hmh5sy805drl5sfnqq1-inkscape.desktop 4.0K
> |    /gnu/store/szdsqp9f75lf8n223994dgnzq0gynxkn-inkscape-1.1.1.tar.xz.drv
> | 4.0K   
> | /gnu/store/zzxliczm87l5l692sbja4md3nlm4kn98-inkscape-1.1.1.tar.xz.drv
> | 8.0K   
> | /gnu/store/0n9gsw2kpbs2affmdz5v8569inic47li-inkscape-1.2.1.tar.xz-builder
> | 8.0K   
> | /gnu/store/gzczswjnbjwishxdcjb38ff50ryz07y6-inkscape-1.2.1-builder 8.0K  
> | 
> | /gnu/store/ldmc19hvi88gffrksh84clpgj4k35phx-inkscape-1.2.1.tar.xz-builder
> | 8.0K   
> | /gnu/store/piy8k5xdfy9lpisz3s539ga643f7lxwp-inkscape-1.1.1.tar.xz-builder
> | 8.0K   
> | /gnu/store/zgr855pyl4nq0wzbgvnls7y62y2hm03g-inkscape-1.2.1-builder 12K   
> | /gnu/store/20051ywrcs9srgmc1yz3n7g39mawwj71-inkscape-1.2.1.drv 12K   
> | /gnu/store/599w24wf1yc77qz98rdny3gl8hbwnk0v-inkscape-1.2.1.drv 12K   
> | /gnu/store/5rm4gq898k7g1m2z8bfdyjlamh4hv94r-inkscape-1.1.1.drv 12K   
> | /gnu/store/75hxh7536csa39ycl3lnfzp72n77640x-inkscape-1.1.1.drv 12K   
> | /gnu/store/9mkpsshqb8f8bvag4dn6fyay83xxi89v-inkscape-1.2.1.drv 12K   
> | /gnu/store/9saq1qq7c7knbpsnyxf2bnq316fzmjc7-inkscape-1.2.1.drv 12K   
> | /gnu/store/bni54rrv8mc1i3i06a5va6kvvv1szkh7-inkscape-1.2.1.drv 12K   
> | /gnu/store/kpxb5da4919c99npg7qpfa2dcb4mqi8h-inkscape-1.2.1.drv 12K   
> | /gnu/store/mmqv80zr7wjh7cys12f4iqkhcmg58i5c-inkscape-1.2.1.drv 12K   
> | /gnu/store/pa7hirai1r6l356xd12ldglgcp7z1x6q-inkscape-1.2.1.drv 12K   
> | /gnu/store/rkkplpgzqri888zq4byznhf1adbrx07l-inkscape-1.2.1.drv 12K   
> | /gnu/store/scqjnhcc1b2fyccy907wavh0maas1afh-inkscape-1.2.1.drv 16K   
> | /gnu/store/fwgd2kvp9g7ag503rx5g1zblxq028wj0-inkscape-1.2.1-builder 16K   
> | /gnu/store/hkhhjy304ma2kzchfr36qnpaf62iq9py-inkscape-1.2.1-builder 16K