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The official spec for both state both the A1 and 4 of both versions are exactly the same size:
Nord Lead A1: 864 x 94 x 272 mm (34.0 x 3.7 x 10.7")
Nord Lead A1R: 466 x 115 x 169 mm (18.3 x 4.5 x 6.6")
Nord Lead 4: 864 x 94 x 272 mm (34.0 x 3.7 x 10.7")
Nord Lead 4R: 466 x 115 x 169 mm (18.3 x 4.5 x 6.6")
Is that definitely correct, as I've read some people saying the A1 is smaller, and this mock up I made certainly implies it assuming the keys are the same size?