No. The 1423 is a two axis controller. If you want to us step/dir, there are a lot of cheaper and less complicated controllers to use. Or did you mean 4123? Even so, that is a two axis controller that can be expanded to 4 axes. The fact that it has 4 D sub connectors is not going to give to 4 axes.
41x3. The x is the number of axes available on the controller. However, it can be upgraded to 4 axes. Just send it to Galil. They will charge $200 for the mod plus $100 per axis added. So The bill would be $400.00 plus shipping to get that controller in the provided link to be 4 axes.
It pays to know what you are buying on eBay. Because unscrupulous or ignorant sellers can misrepresent the controller. The fact that the TOP stickers says 4123 MEANS is is a 2 axis controller. Also, the controller that is linked has amps in it. There are two square Molex connectors that are present and there are two that are not present. Another clue that this is indeed a 2 axis controller. For external drives/amps, that ICM style in not preferred. The I200 ICM is the one for external amps. So from Galil, the part number for a 4 axis controller would be DMC-4143-I200. That is what you want.
Steve