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NSX block the same as a Legend?

Different block. You can search the acura-legend forum. They've been talking about it for a long time. Fact is, things like the pistons and rods don't fit. The oil holes are in different places, etc. AKA, different block.

More details:
1990 Acura Legend Specifications
3.43 in. x 2.95 in.
163.2 cu. in. (2675 cc)

1995 Acura Legend Coupe- Specifications
3.54 in x 3.31 in (90.0 mm x 84.0 mm
196 cu in (3206 cc)

1996 Acura NSX, NSX-T Specifications
3.54 in. x 3.07 in. (90.0 mm x 78.0 mm)
181 cu. in. (2977cc)

1998 Acura NSX Specifications
3.66 in x 3.07 in
194 cu in (3179 cc)
That and the NSX blocks are made out of much stronger materials then the legend blocks