ALL the aftermarket sources who carry decals will have a 402 decal.
Also, as mentioned several times above, a .060 over 396 will be 408, whereas a .060 over 402 will be 414. It is EXTREMELY UNLIKELY that you could ever notice the difference between an equally built 408 vs 414.
Also, it is VERY PROBABLE that any 396 will go to .090 over safely. Thus, you could use .060 over 402 pistons in a .090 over 396.
I specifically make this last point because .090 pistons for a 396 are very uncommon, BUT, .060 pistons for a 402 are as common as dirt. DUUUUUUUH!!!