I believe the Firestar in this game used to be named 'Firewing', which is not Fireheart. You can confirm this by talking to Torrentclaw twice, on the second time type 'Yes' and when he asks who you want to talk about say 'Firestar'. He will then say "Yikes. He's not a fun cat to talk about" and then says "his name was Firewing". Therfore he is not Firestar as in Thunderclan leader. Hopes this helps :P