which engine have i bought?

[vtr91]

ive decided to do a turbo conversion on my saxo vtr, but basically, ive bought another 8v engine so i could rebuild it and get all the bits i need until its nearly time to drop in. But im unsure as to what engine i have bought. i know its the later roller rocker engine, (it turned up today) but the oil fitler has a screw on type other than the paper element type. I dont know if whoever had it before went to the mk1 setup or i have a different engine to whats in my vtr at the moment. How do i find out if it is the same as the one i currently have, as i dont want to find out i need a different wiring harness..

its my fault really for not checking all these things out before i bought it.
thanks