For all "1992-1997 Opel Frontera" and "1992-1998 Opel Frontera Sport", it's Mk1.
https://www.imcdb.org/vehicles_make-Opel_model-Frontera.html
https://www.imcdb.org/vehicles_make-Opel_model-Frontera+Sport.html

And for there:
https://www.imcdb.org/vehicle_979261-Opel-Frontera-Sport-UT2.html
https://www.imcdb.org/vehicle_2112902-Opel-Frontera-Sport-UT2.html
https://www.imcdb.org/vehicle_972876-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_5249-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_454768-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_640228-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_650037-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_684219-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1829376-Opel-Frontera.html
https://www.imcdb.org/vehicle_718084-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_850901-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_875209-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_890138-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_896975-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_911983-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_944396-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1090530-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1096974-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1120758-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1151383-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_967620-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1186360-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1200646-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1224673-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1715281-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1828676-Opel-Frontera-UT4.html

For all "1998-2001 Opel Frontera" and "1999-2003 Opel Frontera Sport", it's Mk2.
https://www.imcdb.org/vehicles_make-Opel_model-Frontera.html
https://www.imcdb.org/vehicles_make-Opel_model-Frontera+Sport.html

And for there:
https://www.imcdb.org/vehicle_615306-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_900234-Opel-Frontera-UT4.html
https://www.imcdb.org/vehicle_1401477-Opel-Frontera-UT4.html

Chassis Code is "UT4" for all Opel Frontera.
Chassis Code is "UT2" for all Opel Frontera Sport.
For all, Origin: Japan, Built in UK and Made for EU.

https://fr.wikipedia.org/wiki/Opel_Frontera