identification of PTE51 vs. PTE53

[87owner]

I know of the 10 vs. 11 blades on the exhaust turbine, but thats it. Both turbos have .60 on the compressor side. One is new in a sealed bag. The packing slip said PTE51>53. The other is on a guys car but not sure which is which.

 

[UNGN]

The turbine and compressor wheels are both bigger on the 53. Should be easy to tell the difference.