Computer case fan, Molex to Molex?

Currently I have 4 of these in my tower:

http://www.amazon.com/gp/customer-media/product-ga...

If you look you can see that one end plugs into the fan and the other end has 1 male molex and 1 female molex, I had 4 extra female molex in my case. so the 4 fans that i currently have are covered i plugged the 4 male ends from the 4 fans into my 4 female in my case, I want to buy 2 more of the same fans, so my question is......since the 4 fans that I currently have the male ends plugged in can I plug the 2 new fans male ends into 2 female ends of the fans that i currently already have? or do i have to buy either a molex splitter or since I also have 2 extra SATA males buy 2 female SATA to male molex...this is all kind of confusing as **** so hopefully someone understands what I mean,