You can use different bioinformatic softwares such as mirTarBase, miRWalk DIANA-Tarbase and others. Most of these websites give experimentally validated miRNAs target genes.

What sort of samples do you have

I appreciate you answer, but my concern wasn't about target for each miRs rather than the interaction between miRs-miRs, specially when I have a different two panels of miRs

thanks again

Check this paper, Regards

I carefully read this paper

Its so good but in reality it need a complex and paid software to interpretation,

I appreciate your answer

But is there another possible way to directly compare this miR-miR with free license websites or software

One approach would be, you make a list of target genes for each miRNAs and then identify similar miRNAs based on commonly shared (overlap) target genes ref: Article Wang Y, Li X, Hu H. Transcriptional regulation of co-express...

Good luck with your analysis.

Kisun