This year I did a small comparison trial between Dolloff pole bean and Golden Lima, Leigh Hurley on her old "Extreme Gardener" blog speculated that they might be descendants of Horticultural Lima, or one or both might BE Horticultural Lima. I planted about 15 row feet of a 50 foot row of Golden Lima, and then had about 6-8 feet of Scarlet Runner Beans as a separator, then finished the row with Dolloff. I wanted to see if the plants had any differences in maturity, vine height, color, etc.
With both varieties now drying down pods, I think I can safely make some initial conclusions. Germination speed was similar, both planted on the same day. They both flowered for the first time within a day or two of each other, and the first dry pods were within a day or two of each other.
Vine length was close enough that I couldn't see any difference, nor could I see any difference in the color of the plants or the pods.
Shelled early seeds are indistinguishable.
So, I can't definitively say that these two varieties are identical, but I can say that they're impossible to tell apart. If you were to mix the seed, you'd never be able to separate them. If they aren't the same variety, they are sister varieties so close that it would take a much larger, more scientific trial to tell them apart from their agronomic characteristics or some kind of DNA comparison.
I really like Dolloff, and Golden Lima is basically the same, so I'm not going to grow it again.