OER RADIATOR

I'm looking at purchasing the OER Radiator Number MA2246A, from Classic Industries, for my 69 Swinger 340, 4 speed. This radiator is a 3 row for an automatic. The stick 3 row and 4 row radiators have been back ordered for a long time.

My original radiator number is 2949066, which I believe is a 2 row, for a stick or an automatic. Any thoughts on whether I would be making a mistake on purchasing this automatic radiator. I don't know why they even have a different radiator for a stick and an automatic. Does it make a difference in cooling?

Thank you in advance for any comments.