Migrate files from 2009 macbook pro using snow leopard to an imac running high sierra.

I am looking to migrate files from my 2009 macbook pro using snow leopard to an imac running high sierra. I will probably just migrate from a time machine backup but i have pictures under two different user names. How can i consildate to one user name I've had to change user to successfully have iPhoto point to older photos don't want to have that issue after migration