I heard that the 280zx 2+2 clutch is stronger then the 2 seater
Only if you keep reading American web sites - their clutch specifications are often very different to ours. We had the HD version in all 280ZX models. Early 280ZX is in common with late 260Z, i.e 240mm diameter friction disc. Late 280ZX is similar spec with less pressure plate bolts. 240Z clutch and early 260Z use a 225mm pressure plate and are not really suitable for higher horsepower cars, although improved versions and equivalent lightweight flywheels are available in this configuration..
Z32 NA is 240mm, Z31 turbo and Z32 TT is 250mm. I'm not convinced that you can easily transfer a Z31 flywheel to an L-series engine. The flywheel is finely machined to fit the end of the crank and any imbalance could be terminal.
All 240mm and 250mm Z and ZX clutches are available in HD and race formats, e.g. Centreforce, ACT, AP, RPS and many others. You should be able to find a clutch that suits your required BHP and proposed activity.
For street use, I would suggest you buy the best organic faced sprung centre clutch kit available, e.g. ACT provide a kit that will handle 400 ft/lbs of torque and has 63% increased clamping force.
If the car is PRIMARILY for race use or will be subjected to higher rpm standing starts on a regular basis (lots of drag racing), then consider a paddle clutch but be aware that it will be difficult to use under stop / start street operation. The ACT 4 or 6 puck clutch kit in 240mm 280ZX format will handle up to 512 ft/lbs of torque with a 63% increase in clamping force.
If swapping clutches from one model to another, always be very wary of changes in installed height which can lead to impossible to release operation or partial disengagement at rest depending on whether your kit is shorter or taller than stock. Adjustments can be made with the variety of release bearing carriers available from other models!