First of all the 3 types very early velcro far right, follwed later 2 popper on the right, then the 1 popper

the repro one on the top with original below

my pen points out some differances shuch as the position of the velcro strip and plastic welding seams



Then the tools, here below is the early Z1 kit with a crest on the tools like the one seen on the screwdriver handle (rare to find a gold crest one)

and here below is a later kit the crest has been replaced by the the big "K" logo

Hope this help