For "Nilsson".
https://www.imcdb.org/vehicles_make-Nilsson.html

For all "S80 Ambulans", "S80 Ambulanse", "S80 Begravningsbil", "S80 Bestattungswagen", "S80 Limousine" chassis-code is "TS" and Mk1.
https://www.imcdb.org/vehicles_make-Nilsson_model-S80+Ambulans.html
https://www.imcdb.org/vehicles_make-Nilsson_model-S80+Ambulanse.html
https://www.imcdb.org/vehicles_make-Nilsson_model-S80+Begravningsbil.html
https://www.imcdb.org/vehicles_make-Nilsson_model-S80+Limousine.html


Except for there:
https://www.imcdb.org/vehicle_423486-Nilsson-S80-Begravningsbil.html
https://www.imcdb.org/vehicle_1551010-Nilsson-S80-Bestattungswagen.html
https://www.imcdb.org/vehicle_1671208-Nilsson-S80-Limousine-2018.html
https://www.imcdb.org/vehicles_make-Nilsson_model-V70+Ambulanse.html
https://www.imcdb.org/vehicle_831383-Nilsson-V70-Ambulans-2007.html
It's Mk2 and not chassis-code.

For there, it's Mk3.
https://www.imcdb.org/vehicles_make-Nilsson_model-V70+Hearse.html
https://www.imcdb.org/vehicles_make-Nilsson_model-V70+Bestattungswagen.html
https://www.imcdb.org/vehicles_make-Nilsson_model-V70+Begravningsbil.html

And this:
https://www.imcdb.org/vehicle_1955237.html
https://www.imcdb.org/vehicle_1824567-Nilsson.html
https://www.imcdb.org/vehicle_1749810-Nilsson-S80-Ambulans.html
https://www.imcdb.org/vehicle_1614038-Nilsson-V70-Ambulance.html