I'll refer to the notes in this post, and again, point out that it makes more sense that this is pointing out the near-identical planes rather than just swapping decals on the sides.
Its Bf-109 here. The very obvious difference will be the canopy. This has 109's iconic boxy canopy and open to the side, Ki-61's is more rounded and slides back
Ki-61 is not a remake, its a different design. They do get misidentified as Bf-109 by Allied pilots.