As far as it could be sorted out so far, there are at least seven equestrian statues in Myanmar, all of Aung San: in Mandalay (the religious centre of Myanmar), in Monywa (Sagaing), Pyay (Bago), Lewe (Nay Pyi Taw council area). Myitkyina (Kacim), Loikaw (Kayah) and in the new capital Nay Pyi Taw.
I could find pictures only of the first three mentioned statues, but unfortunately no years of creation of the statues, neither the names of the sculptors.
The impression is that the movement to honour Aung San, widely considered as the father of the country, with statues, accelerated when his daughter, Aung San Suu Kyi became State Counselor in 2016.
It may be that the erection of these statues is meant to strengthen the identity of Myanmar as an independent and unified country. However, this all is not undisputed by the many ethnic minorities in Myanmar. They tend to see the erection of the monuments as the promotion of the ethnic Bamar majority that dominates the country, while the current government should focus instead on equal rights for ethnic minorities.