Graham Robin tonearm. Linn or Rega geometry ?

[Alvolake]

Would a Graham Robin be a drop-in replacement, geometry-wise, for either of these ? Or better still, what is the correct distance from hole centre to spindle centre ?

 

[Beobloke]

The Robin is a Jelco-based design so it is likely to have a Linn mounting base. It's no longer on the Graham website and there is no information in the Vinyl Engine tonearm database about it, but Sterephile's 2003 review says it has an effective length of 235mm.