You don't have to measure. If the front end of the donor looks the same then it'll fit.
KE70's came out in two lots. The square headlight front end, then the updated slanted headlight front end.
Both models have different guards, apron, bumper, grille, bonnet and headlights.
Early Front
Late Front
All fronts are interchangeable between each other as they all are exactly the same from the front to the A pillar. So that's the Sedan, wagon and van. I'm not to sure about the T-18.