If you are using 24 AWG solid wire such as telephone wire (from a 25-pair or larger telephone cable) or wire from a cat-5 cable for your temporary jumpers, there is an easy and reliable solution for making temporary connections.
You need to get a machine-pin IC socket. You can then break the pins free from the plastic socket and solder the tail end of the pin to whatever wire you want to connect to. Then cover with small heat-shrink tubing, making sure to leave the opening in the socket pin open.
Now you can just use 24 AWG solid wire to connect to whatever you want to connect to. 24 AWG wire is a perfect fit into those socket pins and this makes a very reliable connection.
I just noticed that you would like connectors that are the same for both ends of the connection.
A company called EDAC makes rectangular connectors that are popular in the professional audio industry. Their pins are small and flat and have a slit up the middle. Two such connectors mate by sliding the slits on top of each other. In other words, the flat part of one pin is rotated 90 degrees with respect to the other so that the slits mate up. They then just push together.
Here is an example of the connector pins: EDAC pin They are available as solder-tab, crimp, PCB mount.
These pins are highly reliable because of the wiping action that occurs as they mate.
Doing a Google search on "edac pins" brings up multiple suppliers. They are also readily available from places like eBay.
Digikey has them as part # 151-1049-ND costing about $0.50 each in hundreds. eBay cost is about half of that (200 pcs $50)