If it uses a capo on the 3rd fret in Am you could move it up two frets to the 5th fret and play the chords there but that would be getting pretty high. This works because B is two half steps above A and each fret is a half step.

The other option would be to transcribe each chord to the key of Bm. So in Am you have A B C D E F G A and in Bm you have B C# D E F# G A B. Each note corresponds with a number 1-8 so in A, A would be 1, E would be 5, etc. So to transcribe it you basically just take the chords from the Am version, see what number it is and the find the corresponding chord for it in Bm. For example, if there’s an E7 in the song, E would be the 5 of A, and then the 5 of B would be F#, making F#7. You can then just find some open chord voicing diagrams online and learn them.

Hope this helps a bit. I’d help you out with some tabs but I’m currently away from home and don’t have a guitar with me.