Unfortunately not.

Constructor chaining isn't permitted in C++, it would violate object
lifetime rules.  In .NET, an object is alive before the first user code in
any constructor starts running.  In C++, the object is constructed
piecemeal, and each subobject becomes alive when its constructor starts.
Being able to call a different constructor, would imply the object is born
twice, which isn't allowed.  Why this restriction applies to ref classes,
which follow .NET lifetime rules, I don't know.  But, you can certainly have
a reusable helper function called from more than one constructor (you can't
reuse base and member initialization expressions though).