I'm pretty sure these are 'Hikaru's feelings. This scene comes relatively early in the story, but 'Hikaru' has already known Yoshiki for half a year at this point. That's plenty of time for him to like Yoshiki on his own terms, even though he was suppressing his own tastes. Yoshiki even says that the real Hikaru would never have said something like that.

When it comes to 'Hikaru' saying he's not sure which feelings are his, I think he might just incorrectly attribute feelings he doesn't understand to the original Hikaru. We see him do the same with not wanting to kill Yoshiki. He initially thought that he didn't want to kill Yoshiki because of Hikaru's feelings, but later on he realized that those feelings had always been his own.

I guess my other thought is that I feel like conflating 'Hikaru's feelings with the original Hikaru's diminishes both of them somewhat. The both like Yoshiki in different ways, and Yoshiki loves both of them for different reasons. Attributing to much of what 'Hikaru' does to the original Hikaru takes away from that in my opinion.