Roseola and Measles are similar but they are not the same.
Both Roseola and Measles can have similar symptoms but Roseola and Measles are different diseases that present you with a high fever and a rash.
The Measles disease can be treated and prevented with the MMR vaccine but Roseola is just a disease that you usually have to get through on your own.
Measles is also more serious than Roseola.
Measles can last for several weeks and symptoms of measles can appear 7 to 14 days after you're exposed to the measles virus.
Symptoms of measles include Cough; Rhinorrhea; Fever; Rash.
Symptoms of Roseola include irritability, skin rash, swollen lymph nodes, red spots on the soft palate, runny nose, or sore throat, Fever and loss of appetite.
The fever can last for several days with Roseola and the Roseola rash may appear as many small pink spots.