If the old and new product are in different iblock
add a property with the id of the new item. in the settings of the information block use the same way.
and on the page where this component is lead, it is necessary to do a redirect:
if you are using a standard component, then do a redirect in result_modifier.php template if the component in-house, then in the code of the component itself
If the information block is one, then there is a little bit problematic. I think that will need to independently prescribe rules in urlrewrite, well, then, as described above