on the 150, theres a bigger turbo, front mount intercooler, bigger injectors and different software.
Thats not true
The 130 and 150s share the same injectors
The 150 turbo is bigger but iirc it was only a small difference on a compressor wheel
both have 6 speed boxes
From the information ive gathered over my chats with people
The PD 100 (ATD) and PD115 (AJM) share the same internals
The same Turbos and i think its just the injector nozzle thats different
All of them have there unique ecus
The 100 is a 5 speed the large majority of PD115s are 6 speed someone told me there is some 5 speeds out there but i dont know how true that is.
All the models apart from the 150 have a SMIC
The 100/115 have a 2 bar map sensor and smaller intake pipe/manifold, and mafs where as the 130 has 3 bar map sensor and are bigger
Also from standard the 100/115 the intercooler has jubliee clamped hoses whereas the 130 has the c clip design (which after doing my conversion found out these b!tches like to pop off from time to time when giving your car a bit foot down treatment)
As far as i remember the actual head shell is the same throughout from 100 to 150, i have heard of the camshaft wear but mine is now on 162k with 130/150 injectors and 130 turbo and it still goes fine i have had no symptoms of it maybes it was a design flaw or something in the building of the 130 (ASZ) and the 150 (ARL)
Sorry if its a bit long winded just a bit of what i have gathered

Hope it helps