How to remove duplicate models in assets without breaking scenes

Is there any way to remove duplicate copies of a model without breaking any of the scenes the models are contained in? I have recently merge 4-5 different projects each containing most of the same models, however they were not sorted in the same folders so they didn't merge on import. Basically what I'd like to do is make them all reference 1 copy of the model so that i can delete the rest.

for example:

changing the references from:
models/model1.obj (used in scene 1)
3dmodels/model1.obj (used in scene 2)
objects/model1.obj (used in scene 3)

to:
models/model1.obj (used in scenes 1, 2 and 3)
3dmodels/model1.obj (not used in any scenes)
objects/model1.obj (not used in any scenes)