http://ciisqbg45nggykdl6rjdrq3wc64csga4vkphu66qsi65mypeitqedoad.onion/blog/which-config-to-use
RSA configs are mainly provided to support clients who are still using ancient versions of OpenVPN, ones that don't support ECC. They use 8192-bit RSA. If you've got OpenVPN 2.4.x or newer, then you shouldn't use the RSA configs. These configs will work with UDP or TCP ports 1 through 29999, excluding ports 5061 and 5062.