Hi,
There is no pagination CSS in HikaShop by default and we use the same pagination classes as joomla. It seems however that most of the templates out there don't define these CSS classes and override the whole pagination HTML of the content views. That's why you don't get the same pagination in HikaShop and joomla.
You can modify the pagination CSS in the hikashop CSS edition interface in the config under the tab display. On the forum we already posted some CSS to remove parts of the pagination, so you can use these pieces of CSS code. Then, for further styling, you can look at the pagination HTML with firebug and get the classes names which you can use to tweak the look of the pagination.