ULN2003 Saturation Voltage help
You should surely be able to use the DiMos part in place of the ULN2003 in the application you have shown. The big advantage of the DiMos part is that when the output FET turns on it will pull the output much closer to GND than the ULN2003.

The transistor drivers in the ULN2003 are configured as Darlington pairs of NPN transistors to get high gain. Unfortunately there is a price to be paid for that configuration in that the output transistor can never fully saturate and will end up having that voltage drop of about a volt.