Looking for some help with setting up al UrlRewrite for the same page with different querystring parameters.

Below are the two urls that I am looking to rewrite

stockists.aspx?product=1&fragrance=2
stockists.aspx?store=1

I setup the url rewrite for stockists.aspx?product=1&fragrance=2 (in config/UrlRewriting.config) first and tested successfully.

<add name="Stockists"
  virtualUrl="^~/stockists/(.*)/(.*).aspx"
  rewriteUrlParameter="ExcludeFromClientQueryString"
  destinationUrl="~/stockists.aspx?product=$1&amp;fragrance=$2"
  ignoreCase="true" />

I then setup the url rewrite for stockists.aspx?store=1 (in config/UrlRewriting.config) and now neither url rewrite works.

<add name="Stores"
  virtualUrl="^~/stockists/(.*).aspx"
  rewriteUrlParameter="ExcludeFromClientQueryString"
  destinationUrl="~/stockists.aspx?store=$1"
  ignoreCase="true" />

Any suggestions on how the above can be achieved?