[Stable Update] 2020-11-27 - Kernels, Browsers, Maui-Apps, Pamac 10.0-Beta, Gnome, Mesa, Qt

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In that scenario, systemctl is-enabled UNIT can be used. The exit status will give if the unit is enabled or not on the system and then, according to the exit status, you do the transition or not. You would have something like:

if systemctl is-enabled OLD_UNIT then
    systemctl stop OLD_UNIT
    systemctl disable OLD_UNIT
    systemctl enable NEW_UNIT
    systemctl start NEW_UNIT
endif

Repeat for each unit that needs a transition. Maybe put a for loop if wanted.

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