TD04L Turbo

I need dome insights here. Bought a td04L turbo for my '08 wrx(i know i shouldve went for vf52 but its too late for that) and asked a mechanic shop to install and replace the old one and few hours later they called me and told me that the turbo that i bought doesnt match with the car(oil feed line is different) he said its an aftermarket turbo not original. Anybody can help me understand it.