How to put two different PCBs together?

Splicing is relatively easy to operate. If your PCB software doesn't support it, spell it in CAM350 with gerber file.

Then the gerber file is actually the file needed for plate making, so it is easier to do it in CAM350, as long as you know the meaning of each layer.

Firstly, two circuit boards are imported into CAM350.

Next, move the two circuit boards to the position you want;

Furthermore, the data layers of the two circuit boards are merged, and the same data layer is merged.

Finally, save the file, generate a new gerber, and give it to the manufacturer for production.

Generally, people from the circuit board factory who cooperate with you will also be willing to help you with the puzzle. You can communicate with the people in the board factory.