If your '93 is a LWB, and, hence, a 4.2, your core is likely bigger than the core from a 3.5 '87. Also, you have and engine oil cooler tank on your right side, and a transmission cooler tank on the left side. If my memory serves, the '87 only had one oil cooler tank, but I can't remember which.
The difference between the RN Proline radiator, and the Genuine, is first of all, price. But my son put a Proline in his '93 and it seems to cool better than Genuine, and also has one more row of tubes than Genuine.
Whether it fits or not, do you really want to put a 20 year old radiator (assuming it too is '87) in your truck?
Almost forgot; check the top mount spacing, which can be altered, and the bottom pin spacing, which can't readily be altered.
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