Can a fraction be simplified using Anomalous Cancellation?
Pyth, 22 19 bytes
Thanks to @isaacg for three bytes!
qFcMsMM,Jcz\/.-M_BJ

Explanation:
qFcMsMM,Jcz\/.-M_BJ      Implicit: z=input().
       ,                 two-element list
        Jcz\/              J = split z on ','
                _BJ      Bifurcate reverse: [J,reversed(J)]
             .-M         map multiset difference of elements in both lists
                             this gives the multiset difference both ways
       ,Jcz\/.-M_BJ      On input 1019/5095: [['1019','5095'], ['11','55']]
    sMM                  convert all strings to numbers
  cM                     map by float division
qF                       fold equality

Try it here.