It matters if you know and use theory. It may not matter at the most basic level...but it does matter. To understand why, you have to go down the rabbit hole a ways.
If you actually care, read on.
The key of F# major includes: F#,G#,A#,B,C#,D#,E#
AFAIK, this is the key the song is actually written in.
So when you are in the key of F# major you tend to think in terms of these notes and all of the intervals that are possible using them.
For example from the song we are discussing: F#, C#, D#, B is the intervals 1, 5, 6, 4 in F# Maj. FYI, someone who regularly uses root movement analysis will generate these numbers pretty much instantly and automatically.
We could think of the song in Gb major if you like. The key of Gb major includes: Gb, Ab, Bb, Cb, Db, Eb, F,
In Gb major, the intervals 1, 5, 6, 4 translates to Gb, Db, Eb, Cb
But notice, the OP used Gb, Db, Eb, B.
To the listener, the notes Gb, Db, Eb, Cb will sound exactly the same as Gb, Db, Eb, B.
..assuming the musicians play them exactly the same, which is not guaranteed.
As a player using theory, if you see a note that is not part of the prevailing key center, it catches your attention.
Since we are thinking in Gb major and discussing the notes Gb, Db, Eb, B, we should immediately notice B does not belong.
You could possibly treat it as chromatic.
Then Gb, Db, Eb, B translates to 1, 5, 6, +3
As a person trained in theory, I don't expect to see a +3, so this could cause problems.
Here's why.
Normally chords are built in thirds above the root. We call this tertian harmony.
Let's do the harmonization in Gb Major since that is the OP's assumed key
Here are the correct notes and intervals:
Gb, Db, Eb, Cb
1, 5, 6, 4
1
Gb, Bb, Db, F (GbMaj7)
5
Db, F, Ab, Cb (Db7)
6
Eb, Gb, Bb, Db (Ebmin7)
4
Cb, Eb, Gb, Bb (CbMaj7)
All of the notes and chords are diatonic to Gb major

.
Now let's harmonize the OP's notes.
Gb, Db, Eb, B
1, 5, 6, +3
I'll do the harmonization under the assumption B is a chromatic alteration...I.E. it's not diatonic...otherwise it will get even more messy.
1
Gb, Bb, Db, F (GbMaj7)
5
Db, F, Ab, Cb (Db7)
6
Eb, Gb, Bb, Db (Ebmin7)
Nothing is different so, but that is about to change
.
+3
B, Db, F, Ab --Not sure what to call this, but it's what you get in the key of Gb major when you build a chord in 3rds from B.
It's certainly not the expected chord

. Compare to:
4
Cb, Eb, Gb, Bb (CbMaj7)
Essentially the root winds up being the only correct note.
Enharmonically you could say this sounds like CbMaj7
B, Eb, Gb, Bb. I wouldn't recognize the chord if I heard these intervals or saw it spelled this way. So it's not an effective way to communicate with other musicians

.
I know TLDR