Full Idea
Given Russell's notion of a proposition, as an arrangement of objects and properties, it is hard to see how there could be any difference at all between such a proposition and the fact corresponding to it, since they each involve the same arrangement.
Gist of Idea
For Russell, both propositions and facts are arrangements of objects, so obviously they correspond
Source
comment on Bertrand Russell (On the Nature of Truth and Falsehood [1910]) by Paul Horwich - Truth (2nd edn) Ch.7.35
Book Reference
Horwich,Paul: 'Truth (2nd edn)' [OUP 1998], p.106
A Reaction
This seems a little unfair, given that Russell (in 1912) uses the notion now referred to as 'congruence', so that the correspondence is not in the objects and properties, but in how they are 'ordered', which may differ between proposition and fact.