I'm a mathematician and I love using the MathSciNet and zbMATH databases to trawl through the literature, find new papers, and generate citations. So in my own papers, in my own bibliography, it makes sense to mention the zbMATH and MR numbers of every paper I cite: I believe that bibliographies should be maximally useful.
The problem is that when I generate a citation using zbMATH, it only has the zbMATH number, not the MR number. (And vice versa.) I could find the other number by just looking up the article in the other database, but that's more effort than I'm willing to put into this.
Question: Given a zbMATH number, is there an easy way to identify the corresponding MR number of the underlying article, if it exists? (And vice versa, MR to zbMATH.)
Somehow I suspect that neither MathSciNet nor zbMATH maintains these cross-references. It's not in their interest (especially for MathSciNet) because it would make it easy for users to switch from one database to another, risking a "day of reckoning" when the mass of users finally come to prefer one of these nearly identical objects over the other. (And with zbMATH being free, it could very well win out . . .)
So I don't have much hope, but hopefully someone will pleasantly surprise me!