A4 vs US Legal

A4 is 210 × 297 mm (8.27 × 11.69 in); US Legal is 215.9 × 355.6 mm (8.5 × 14 in). The difference: -5.9 mm in width and -58.6 mm in height, A4 relative to US Legal — drawn below at one shared, true scale.

Each on its own