zx 5 newbie needs help!!!

[mary_p_o_o]

hi all,
great forum by the way, i have recently purchased a rtr lazer zx 5 to get back on the RC scene after many years away, all is well with the rtr but i have obtained another rolling shell to use as spares, it has quite a few differences from the rtr, alloy parts etc, is there any way of telling is it is the sp version,

did kyosho only do the rtr and the sp or were there many other variants??
any help would be a great help,
thanks guys, mike