.......................
In terms of hearing. If I input G#maj in E major alone, it sounds like
It's different from the way I play when I type C#maj in the key of A major alone.

This difference, I didn't feel it in the transposition.

[/quote]

My guess is that you are hearing different inversions of those chords?

我的猜测是你听到了这些和弦的不同转位

I hope Google translated that correctly.

I arrived early to a restaurant.
The manager asks, "do you mind waiting a bit?"
I said no.
"Good", he said. "Take these drinks to table 3"

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware