Howrah Rajdhani has more seats availability quota for Gaya than 12314 sealdah rajdhani.
.
It may get confirm based upon SS Lower Berth quota.
Usually seats used to available in General quota upto end Sealdah.
But...
more... the summer rush in Tatkal also got full.
TQWL# 37 / WL# 11
TQWL# 10 / WL# 5
.
For travelling in Rajdhani to Gaya in order to get berth, better prefer these sequence :
1) Bhubaneswar
2) Ranchi Biweekly
3) Howrah
4) Sealdah (at last. )