Your young gourami looks uncannily like mine did when he was a baby. Mine was Osphrenemus Laticlavius (red tailed giant gourami). But I knew from the get go exactly which one mine was, because I bought him as a red tail! The red on his fins started coming through after a couple of months.
The other three possibilities are the Osphrenemus Septemfasciatus, the Osphrenemus Exodon and the Osphrenemus Goramy.
But to be honest juveniles from each species can be very difficult to tell apart.
As it grows you'll be able to tell more easily, and it'll grow quick!!