Sizes are different but also appliances were a lot more temperamental back then; the first oven with a temperature control was only developed in the 20s and it would take a while for them to be in every home.

If anything, much older recipes tend to be less precise simply because they did not have the technology. Before thermostats were put in ovens, baking was done by feeding a fire by vibes, and then leaving your baked good to sit in the residual heat.