If (as I do) you have both P3Dv4.5 and P3Dv5.1 installed on the same computer, you can make the one installation work in both sims without having two sets of files.
In your ‘add-ons.cfg’ in P3Dv5.1, add the following — which will point at the P3Dv4.5 installation:
PATH=C:\Users\<yourname>\Documents\Prepar3D v4 Add-ons\Bookmark Simulations
Change the X to the next number in sequence, and the ‘yourname’ as appropriate.
This will obviously have to change once the P3Dv5.1-specific version of the Draken is launched.