Any difference between this 2 version? I am planning to purchase one soon. Please let me know in the comment down below.

Great question! From my research, I can't find any differences between the two guitars. However, the 145x model is not on their website. Only the 165x model is. Could be the same guitar, but model numbers changed as their brand developed and they added/took away guitar lines? Just a guess. Maybe someone else has a better answer!