Radiator confusion = Is it Possible the l6 250 Rad is the same as the 350?

[CKfan]

I get more confused every time I research this radiator business. My inline-6 292 manual trans (69 K10) had the heavy duty radiator listed on the SPID as option V01.

I am assuming from what I have read, it is the same as the big block units but being 50 + years old it may have been swapped out at some point. Rad shop said mine was repaired with JB weld, solder and a few other things on too many times to save. I have a couple 3 row inposters on standby while I search for a 4 row "correct??" replacement.