It seems that acceleration at some point in Rindler coordinates completely determines it's distance from rindler horizon, right? If we have two rockets with equal hight and experiencing equal acceleration at the bottom there are no other parameters we can vary to get different results for two cases. So that means that time dilation at the top of the rocket is the same for both rockets. That contrasts with gravitational field where we have two parameters determining acceleration (r and rs) so we don't know time dilation at the top of the rocket given acceleration at the bottom (and given hight) if it stand on the surface of some gravitating body. So it seems that there is no limiting case where proper acceleration and gravitational acceleration would tend to become equal.