Can I use solid state output and relay output with the same components?
I think you are asking can you mix or feed some of your devices from solid-state outputs and some from relays. The answer to that is yes, subject to the limits specified in the datasheet.

The device is supplied with both because for some applications the SS outputs are more reliable when used for high-frequency switching but they only work with DC. The relay outputs can be used on both DC and AC over a wide range of voltages and so are more flexible.