The studs on a series 3 hub are a larger diameter.
When i changed my series 2a hubs to series 3, the half shafts fitted ok.
I forgot to mention you will need pre 1981 hubs, post 1981 are different.
TD4 is a four cylinder diesel engine, if you must buy a Freelander that is the best model. Do not touch a petrol with barge pole. Full genuine service history is essential.
Someone may be along shortly who will disagree, just my two penneth.