Hinges and More on Locks
According to the lumber yard we patronize, the way to identify replacement hinges is to measure from top to bottom of the existing materials. Then note if the corners are rounded or squared.
Also make sure to replace exterior hinges with exterior hinges. There will be a difference in price too.
When it comes to using old keys with new locks, we opted for destruction of the old locks so someone cannot create keys from the discarded devices that would work with the new hardware.