Easy conversion if you plan ahead, All comes down to money as usual.
Take 1x smashed R33, Remove engine/box complete with crossmembers.
Swap engine harness, heater hoses and fittings, smic, power steering, slave cylinder etc
Fit 25 into R32, sort wiring, tailshaft, intercooler pipes, speedo drive.
Its the knowledge and this site that makes it EASY, A hoist helps!