Is it possible to run Openhab on the same card with domoticz on RPI 3B?

Setup, Configuration and Use Installation
1

I have an running Domoticz and would like to try Openhab. An Influxdb and Grafana installed also

2

If you just want to try openHAB, you could install it on your normal computer.
The installation information is available to different OS.
If you are pleased with it then you can always install OH on the PI later and migrate your configuration files.