Radiator swap question

[willem445]

So my 1980 Chevy K20 (350/SM465/NP205, no A/C) radiator started leaking antifreeze all over the place. I'm looking to swap it with a radiator that I had in a 1978 C10 parts truck. The C10 parts truck had an automatic transmission (not sure on model) as well as A/C.

My old leaking radiator only had the input/output & overflow holes whereas this C10 radiator has 4 additional holes. 2 of them (red arrows) had nothing connected to them & don't appear to be plugged (I'm not sure if I disconnected something a while back or if I bought it this way). The other 2 (red arrows) had steel lines connected and had what appeared to be oil run out when I cut the line.

Any idea if I can just plug the additional 4 holes and use this radiator? The measurements appear to be roughly similar.