Ethan they do have a strange look like noni and skinned pineapple as Oscar said.The skin is thin and the fruit more spongy than jackfruit.You would see more diversity of them in Malaysia alright as only selected ones were brought to here from SE Asia.It would be the same for most fruit like mangoes, black sapote in mexico,abiu in brazil,macadamias here or jackfruit in india.
There is the Founder's Effect that operates like island biogeography.It allows selection from a smaller gene pool to make things change faster or have selected features get expressed more.