Which pistons are these? Hypereutectic? 93 Cobra??

skratpiece

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I have two sets of pistons. I have identified the piston and rod on the top as a 87-92 H.O. TRW Forged piston and matching rod. I need to know what the piston on the bottom of the photo is.
IMAG0345.jpg

Piston on top is 87-92 Stock H.O. Forged TRW. (E7ZE-6110-CA)
Piston on bottom is unknown. (no part #)
IMAG0344.jpg

As you can see they are different. Hopefully someone here knows. I suspect the unknown piston is a Hypereutectic out of a 93 Cobra, and the part number on the rods come back to a 5.0 Explorer(F2TE-BA-AQ51). Did the 93 Cobra and Explorer 5.0 share a part number? Are the rods that came with Hypereutectic pistons different than what came with Forged?
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IMAG0353.jpg
 
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red95gts

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Seeing as they went to hypers in mid-92, the F2 part number makes sense. However, I've never looked that closely at the hyper vs. forged pistons so I don't know for sure.
 

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