## Pyth, <s>22</s> 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](https://pyth.herokuapp.com/?code=qFmcFsMd%2CJcz%5C%2Fm.-Fd_BJ&input=1019%2F5095&debug=1).