Unless it's a torque to yield it will be fine. What's the Haynes tightening sequence ? A set torque or a torque then a further angle ?
I 're use them on zetec's ect. They often state to replace if they had a thread sealant on them. As this won't be affective any more. Ie zetec flywheel bolts.

Often torque to yeild can be 're used by checking the amount of stretch.

Most important is to 're tighten fully to the proper torque as most engines are not keyed any more and the timing is only held by the clamping force. Ie Duratec petrol but that's got a chain not a belt.