yes it does, but it has bugs if u do it like that, this is better:
before u start make these variables: goku_hp, type: real and goku_lvl, type: real
events: unit enters region
conditions: unit type of entering (or triggering) unit equal to goku
actions:set goku_hp = life of goku
set goku_lvl = herolevel of goku
wait 0.01 sec
replace goku with supersayan
set life of lastcreated unit to life of goku_hp
set lvl of lastcreated unit to lvl of goku_lvl