Upgrade from carve 162 to futura 155/Yes or No

[speedlagoon]

The new futura looks great , my question is at this time i one a carve 162 d-ram 2006, Sails that i drive a overdrive r2 10.0 and a 8.5..(my weight 100kg)
When i change to the futura 155, will plane then a little bit earlier, and is the futura 155 faster than the carve 162..
And what is the biggest fin i can use on the futura on the carve i use a 59cm select superfast when i use the 10.0 sail.
Can i use on the futura a starboard r13 64cm fin in very light winds(i have this fin),

What is the difference between these to Boards....

Mike