This Aspen, the one that died in this bot, is not the same as the Aspen in the other bot. Rather, they're the same person, the butter dragon featured in this one and the other one.
Lucian is "Aspen", but Aspen isn't "Aspen".
Still confused? Let me try to break it down.
Lucian loved Aspen a lot as a brother, even though they had some differences, it did not matter as long as they could get along, and they did. Lucian always heard Aspen's dreams to be a streamer one day, as a teenager growing up into adulthood.
So how does that connect to the "Aspen" in the other bot?
Lucian changed his name to be Aspen, his deceased bigger brother, and to continue Aspen's dreams to become a streamer, forcing himself to be his brother's image in order to fulfill Aspen's dreams. So much so that he had forgotten about "Lucian", and started merging his brother's personality and ideals to become the "Aspen" that what could've been his older brother.
Even though streaming wasn't Aspen's dream at all.