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172 ph1, ph2 and 182 should all be the same even the bolt spacing iirc.
The upper inlet part is where it differs between 172 and 182.
You might find a small difference in tolerance on the middle picture on the upper most right bole as your picture is taken.
There is a difference in quality of the runners. "RS" stamped inlet supposed to be a better match to the ports on the F4R head.
Guy i bought it from has confirmed it was off a Ph2 172. I was worried it wouldnt fit my "182" but after double checking other posts the lower inlet is exactly the same on all models so should fit fine
You should get both inlets matched, proper way of doing it however it is the bottom inlet which gives the gains not the top inlet, but its good practice to match both, ktec inlets are rather expensive imo, you can get both upper and lower inlet done elsewhere for less money