K12 Micra G spec with HR15DE CVT 990kg
C11 Tiida G spec with HR15DE CVT 1150kg
C11 Tiida S spec with HR15DE 4spd auto 1110kg (S spec no fog lights, rear seat tilt, leather steering wheel, rear centre arm rest)
C11 Tiida G spec with MR18DE CVT 1180kg
From the japanese figures above a K12 with MR18DE (or MR20) & CVT would weigh 1020kg
C11 Tiida ST hatch with MR18DE 6spd 1120kg
C11 Tiida ST hatch with MR18DE 4spd auto 1136kg
These are from the nissan NZ site
Nissan USA offers the C11 Tiida (Versa) with manual, auto & CVT boxes.
Auto is 13kg heavier than manual. CVT is 18kg heavier than manual.
This suggests a K12 with MR18DE (or MR20) & 6spd would weigh 1002kg
K11 front track 1470mm
C11 front track 1480mm
Tracks are almost the same. Quite likely the difference in in tyre/rim size/offset. I'd say the half shafts, gearbox, mounts are all likely to swap over. Probably some bigger brakes too.
The Clio III uses the MR20DE (M4R) engine, althought that appears to be 200kg heavier than what a K12 Micra would be with the same engine.
Incidently, the 2 door appears to be 30kg lighter that 5 door.
K12 12c CR12DE 5spd 2dr 870kg
K12 12c CR12DE 5spd 5dr 900kg