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

[Yamariv]

Hey guys,

I'm currently doing a full service on my cooling system to get it ready before the hot weather hits.. I did a flush today and was planning on bringing in my original I6 250 rad into the rad shop to get it steam cleaned and pressure tested. My Dad had a good point suggesting I see what a bigger new rad would cost instead of dumping money into the old one. I was thinking of going bigger so that I've already got that angle covered if I decide to go with a SBC in the future.

I called my parts guy and he said his system shows the L6 250's rad the same as the 350 SBC for the 1971 year. I also checked Rock Auto and they suggest the exact same rads as replacements for the L6 and the 350 as well.

Is this possible??