Hilton does have something akin to policy for walking a Diamond, but it's definitely not points equivalent to one stay at the same Cat as the offending hotel.

My wife (Diamond) encountered a scenario that I consider being walked and I called Diamond desk asking about the policy. Hampton Inn is $100 cash. Hilton Garden Inn is supposed to be either $100 or $200.

The GM of the offending hotel that I asked about was offered the opportunity tio address this issue, but he has not responded in over a month.

Yes, Hilton is far behind Starwood and Marriott for rules regarding walking a top tier elite.