I have ten DHT-11. I placed them within 100cm of each other to determine the variance. seven were +/- 1C, but a two were +/- 2C, and one was +/- 4C of the average. In other words, the absolute temperature is unreliable. I didn't do a long term study, but I suspect that the part is a POS. The LM35 that is commonly used has similar part-to-part variation. Either one, you'll have to find a way to calibrate it.
I don't know this SBC, specifically. I don't think it matters, but there might be pins that are used specifically for some other device, No big deal to move it. If your SBC doesn't have a library for it, I used an Arduino script to "bit-bang" it. (definition of "bit-bang": high level control of a single pin, toggling it high/low for output and using a timing loop to observe the the input.) This script could be easily port to your SBC.