I too had 2 species for which i made RNA-Seq libraries and identified SNPs which were more than 300k in number. The main objective for SNP detection for us is to genotype Recombinant Inbred line population that was derived from these two 2 species. If you have something like that then you can use these SNPs or atleast you can provide them as community resource if some one decide to generate/generated RILs from the 2 species that you worked with. Alternatively you can annotate these SNPs using tools such as snpeff and derive some interesting conclusions. If you are interested you can refer my attached paper which was published recently.