I suppose with the new technology -
When I was learning we had a corn planter for corn -
and a grain drill for beans and wheat... Two different machines
Most farmers still plant that way. Corn is typically a row-planter in 30 inch rows. Beans are planted with a drill, in 7 to 10 inch rows, or with a different row-planter, in 15, 20 or 30 inch rows. There is also a wide variety of dual row planters for beans, that gives you a dual row, 8 to 10 inches apart, and those dual rows are 30 inches apart. Lots of variety out there these days. Wheat is almost always planted with a drill, in 7 to 10 inch rows.
These are the pictures I took yesterday...

These pictures that BRD provided are not of a combine with a corn head. That head is used for beans.
If you look closely at the gathering chains, there aren't any! Lol
The feeding mechanism is totally different than a corn head, and I looked on their website to make sure, and the corn head they do make looks very different from this. This head is their all-purpose head, which is used for soybeans. My guess is that this head design (as opposed to a standard cutter bar) helps to eliminate harvesting stray weeds, and helps to recover plants that have fallen over. They also make a cutter bar head, that I assume they use for wheat.
Many years ago, John Deere used to make a soybean header for their combines, that looked like a corn head with the pointy snouts, but was used strictly for harvesting soybeans planted in rows. If memory serves me right, those were 20 inch rows. I think that was an experiment that never caught on, though.