The "Rasengan" was created by the Fourth Hokage, Minato Namikaze, who took three years to develop it. The Rasengan is based on the Beast Ball with Tail, which is the definitive attack of the Beasts with Tail.
So that it isn't difficult to confuse one technique with the other, but answering the question what in fact uses naruto in that chapter is a "partial" rasengan with chakra of the 9 tails beast.
During the manga different versions of this combination are seen, but in any case is the tail beast bomb. It is a fusion between the two techniques or simply the utilisation of Kurama's chakra.