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Both serve the same purpose. But the Wire buffer has a buffer in between. This can be used to insert delays in the line and also to improve the drive strength / fan-out of such signals.
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It wouldnt do this by default - duplicate logic is usually optimised away, unless specified max fan outs are reached, or attributes/assignments are made. Maybe in old compilers in old technologies would this have been possible without using attributes or assignments.
The wire primitive in BDF doesnt have much more use than a signal re-naming block.
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