... when i search about other keyboards especially Ew425 it has quite more indian style which aren't present in my INDIAN KEYBOARD.
Hi.
I see that you are referring to the styles, # 243 to 253, under World2 group. On the I500, the Indian styles are at the very beginning... # 1 to 50. I do not understand why you say the 11 styles are more than the 50. May be, the EW425 has new styles that you like but it doesn't have more than the I500.
As pointed out above, the EW425/E473 is a newer model and probably has newer styles. Have you tried the free download available on Yamaha site called I500 Festival Pack? I remember seeing another download from Yamaha for the I500 as well.
You might get more styles by installing those packs.
I am specifically interested in Mridangam sounds. So, I researched on that side not all the Indian tones and styles. As far as I can see there are only 7 Mridangam sounds in the E473 and EW425, in Indian Kit 2 (voice # 319). I believe the 5 sounds in Indian Kit 1 (voice # 318) are same sounds with a different name. The I500 on the other hand has 25 distinct Mridangam sounds, all repeated in two different kits. For my purposes, the I500 has more usable Indian sounds. I didn't have a chance to try them because this instrument is not in a store near me.
All the best.