xtcommerce to woocommerce

Hey,

my customer using a xtcommerce shopsystem. I want to switch this Shop to woocommerce. There are ~1200 customers and over 600 Products.

first of all, can i get the customers, products and maybe orders into a new woocommerce?

second thing is the seo. his system is runing abount 5 years now and he is ranked on #1 in google. If we switch the system the product links and ids will be lost.
Is there any way to “move” this ranking

best regards
Tom