Hi,
The 1992 and 1993 take the same radiator as I mentioned, 52456222. That is the original part number for your vehicle. The number used prior to that is 52458320 which is your original question. If you look at pics 1 and 2, I highlighted the part number from my manual for both model years. Note they are the same.
In pic 3, I looked up that 52456222 and it shows it replaced the 52458320. That is from a GM parts page. Based on that information, they should be the same radiator. The part available to you, 52458320 was replaced with 52456222. Chances are there was a slight change in some slight way, but it should work. From what I'm reading, 52456222 is a replacement number for the same part.
Let me know.
Joe
See pics below.
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Friday, June 3rd, 2022 AT 7:11 PM