moving users from one DB to another

-- url of the page with the problem -- : mybabylonia.gr
-- HikaShop version -- : 2.3.0
-- Joomla version -- : 2.5.4
-- PHP version -- : x.x.x
-- Browser(s) name and version -- : XXXXX x.x.x
-- Error-message(debug-mod must be tuned on) -- : Error_message

Trying to move user details from one DB to another, and I noticed that the user IDs in Joomla 2.5.4, are different than those in Hikashop for the same person.

How are they linked?

so I noticed that they have two different Id's. on is the CMS id and one for hikashop

What will happen if I only import the CMS user table,? what will that mean for hika shop?

Well,
I just moved across the normal joomla user table users.
I did not move any info from hika shop tables as I was getting lost with all the ids.
There were different users with the same id in these two databases, and I manually changed the users table ids.
Lost track trying to do it for hikashop's tables.

see I don't have the original hikashop archive in order to install it again.
Is there something else I can do?
Or should I only import the hikashop_user table and no other hikashop tables?

I imported the Hikashop user table.
Then I double checked the cms user ids of the hikashop_users and made sure that they were correctly pointing to the joomla user ids.
So now the users are all there.
In order to import the order history and addresses, I will have to go through one by one and check all the ids... in order to manually import the information.
I guess I could do it with a lot of work, but don't know if I want to experiment any longer since the site is now live and users are accessing the site making orders.