It will be really difficult because a lot of features are not implemented on the same way (or not implemented at all). For example LimitCPU= can be replaced by s6-softlimit at the @ execute field. ProtectSystem= will be implemented by 66-ns at the @ execute field. And so on. But a rosetta sheet like this one
https://wiki.archlinux.org/index.php/Pacman/Rosetta can be really useful