the difference is who is making it...which book they are using. different people designed quilts using a specific technique...and called it what they thought was a good name...there are differences...a stack and wack you stack up layers of fabric cut it all together, rearrange the pieces and re-sew them...so stack & wacks are not always kaleidoscopes...
one block wonders and kaleidoscopes are pretty much the same; some times (depending on the pattern you have) the one block wonders are put together ...one block at a time...where as (some kaleidoscopes) are constructed in rows instead of in individual blocks