Some roaning genes allow for roaning on different parts of the body. They are not from the roan (Rn) gene. The roan gene basically puts white on the body to varying degrees. Roan and grey can also occur on the same horse. Roan will leave an inverted V on the leg and the face dark. Mane and tail are not affected. Roan also does not change. It stays the same year to year. There may be seasonal differences but the horse will not progress beyond what they have and grey horse will continue to progress until the horse is white.
Some horse people change their horse, they change their tack and discipline, they change their instructor; they never change themselves.