There's plenty. XR200 is 19mm wide but weighs around 385g. R460 is 23mm wide and weighs 460g. But the ERDs are very close (594 v 596) so they can be swapped easily.
@Brommers started
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There's plenty. XR200 is 19mm wide but weighs around 385g. R460 is 23mm wide and weighs 460g. But the ERDs are very close (594 v 596) so they can be swapped easily.