AMP vs WE/SS RJ45 Connectors

I was looking to buy a new All-in-One crimping tool for RJ45, RJ11/RJ12 and RJ22 when I got stuck with two RJ45 styles:

Western Electric (WE)/ Stewart Stamping (SS) & AMP.

Obviously it caught my attention to find about the WE/SS style connector but I haven’t find anything so far. All I know it has to be to the crimping points in the RJ45 connector but does it…

Can someone explain it please?

Thanks