Hi, I feel that it will not be easy to transit from guitar to bass. In fact, I think it is darn hard. Yea, all those theory is the same, but how to apply them to your playing is different. If you have been a guitarist for a while, it is not easy for you to play the bass, while your head is still thinking of how to solo like a guitarist, you get what I mean?
It appears to me that there are so many more things you can do to sound impressive on a guitar, but much lesser things to do to sound good on the bass, hence giving me the impression that it is not easy to be a bassist. I am not suggesting that the bass is less versatile, but I am saying that given the nature of the bass and the role of the bassist, it really takes alot of genius and talent to be a good bassist.