Krsna, after returning to His father's home at Dvaraka, came to see Kuruksetra during some solar eclipse. At that time His sister Subhadra and brother Balarama also came in a chariot, and this incident is worshiped as Jagannatha Rathayatra. The conclusion is that Jagannatha and Krsna is the same.
Letter to Tamala Krsna, 15 May, 1970