similarProxy_objects =#()

try
(
	file=selection[1].filename
	for o in $* do
		if (classof o == vrayproxy) do
			if (o.filename == file) do append similarProxy_objects o
)
catch(format "No filename property in: %" selection[1])

select similarProxy_objects

Selects all vray proxys in the scene which have the same vrmesh as your current selection. (For those Oops, thats not an instance moments.)

Select Related VrayProxys

Maxscript