You can snip the tab off of the Futaba connectors, and then they will fit into any other brand of receiver.

Another thing to watch between servo brands is that some of them are reversed from the others. This is not a important if you are matching brands where you need to match servos, or if you are installing them in your plane for the first time, but if you ever replace a servo with another brand of servo, you may have to reverse that channel (and retrim it). I replaced a standard Airtronics servo with a standard Futaba servo, and had to reverse the channel on my TX afterwards.