Frist Repositioning Cruise and B2B - What do I need to know

[canadiandisneyfamof4]

We are on the Magic for the Oct 11 Southern Caribbean. Tomorrow we are booking the 3 night repo cruise from San Juan to Port Canaveral - fingers crossed we can get the same room for both, I'm not picky told my TA to get whatever she could in my 5C category that ave me the same room for both.

We have done a 7 night cruise on the Fantasy with another 7 night scheduled this August.
This is my first repo and first B2B so; What is different and what do I need to know

Thanks