If you're a bit concerned about this, we'd like to explain the process. Sails are made to fit your boat, for the kind of sailing you want to do, and the winds and waters you sail in. We need the make and model. So, be explicit. Builders often make changes year by year.
Many builders offer standard and tall rigs.
For example, the Catalina 30 comes either way and there is a very large difference between the two masts. Owners occasionally lengthen their boom or add a short bowsprit to increase sail area on under-canvassed boats. Sails cut for long ocean swells should have a different shape from those used in choppy waters. Some places have strong winds, others zephyrs. The choice of materials and features you should have will vary to suit your usage.