No.
At present, the Drawing app sets a standard size of the canvas depending on the device you are using to draw. In other words, iPad will have larger canvas compared to an iPhone. However, we are planning to have a feature to customize the DPI and real-world dimensions (inch/centimeter) for your digital canvas.
If you are looking for such an option to set DPI, do not hesitate to write. We prioritize features based on user votes!