Just recieved a turbo from a seller on Ebay. He claimed it is a T34. How do I tell firstly that it is a T34 and secondly, if it isnt, what sort of turbo it is

Written on it is:

Compressor: Garrett A/R .42 BC1
Exhaust: A/R -4 DH4 ?OE M4 DH56 NI

Is there something I can measure to help?

Hope you can help before I have to leave feedback or ask for my money back

Cheers guys

Justin P