Saraca declinata (Red Saraca) looks very similar to Saraca indica (Ashoka Tree). Both their flowers changed from yellow to bright red over time, with purple or crimson eye. The main visible difference between the two plants is at the flower level. In Saraca declinata, there are 5 to 6 stamens (male part of the flower) while Saraca indica has 7 to 8 stamens.
(1) Corner EJH. (1952) Wayside Trees of Malaya. Volume 1. 2nd edition. 401 pp.