The chances of a TV bracket fixing holes precisely matching the distance between studs is low.
It may be that additional reinforcement was originally installed - but I suspect unlikely.
A purely personal view - plasterboard fixings will support a medium/large TV flat against the wall but I would not want to make it adjustable. It will be more vulnerable to damage, may over-stress the wall fixings, and unless a high quality mount likely to sag under the weight of TV.
If you want to be be certain of a firm mount, a ply board (12mm or more) fitted between two studs would be sensible. TV mounting can be through the ply.
Screw directly into the studs - no special fixings needed, just use ~75mm screws for a strong job. Studs are normally at 400mm or 600mm centres.
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