post the song up here.... or in the Showcase so we can hear what you're talking about.

It sounded to me like you were unsure about what you had achieved and were asking if it was right....

You asked "Does it make sense if you try three different guitar sounds for these three tracks?

In real life, sometimes I see three or more guitars accompanying the singer. Can these guitarists use different guitars or do they need to use guitars which are similar?"

well the answer to that depends on exactly what you want.

If you like the sound of the 3 tracks keep them.... it's not a crime, a sin, or illegal to do so. If, on the other hand, you want some variety, certainly again, it's not a crime, a sin, or illegal to use 3 different sounding guitars.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.