Help Nur Spec Short Block Part No Confusion

[ZimNismoBoy]

So have been on the net a while and i have been looking at different options for long block assemblies.

I have gone into the fast system and pulled this part number for a Nissan short block assembly for my gtr34 Vspec II Nur

10103-AB051

Now i have emailed power house racing about this as well and have not been given a confirmed answer so im posting on here

The engine being sold on powerhouseracing website says its a Nur short block assembly but has a different part number

10103-AA450

So what is the difference between these two, can any one with enough knowledge say what exactly is going on here ?

Which engine represents which model of car, am i right in saying the AA450 engine is from the Gtr32 and Gtr33 series and the AB051 is from the gtr34 engine series ?

Im very confused, to make matters worse the short block assembly from Japan for the AB051 i was quoted is 6000usd

And the AA450 i was also quoted the same price .

But on power house racing website its 4850.00 Usd .

Should i be scared of buying that particular motor ?

Hope you guys can help thankyou.

[ZimNismoBoy]

Still No one can answer this one ?

Come one guys some one must know ?