In general, all scripts (test cases) should have the same steps when using the Hexawise Auto-Scripts feature.
An important consideration in a Hexawise test plan is, "Can I test all these test cases with the same number of steps?" If the answer is no, then you should probably reconsider the scope of your test plan, as it's likely you're trying to include too much testing scope in a single plan.
Another rule of thumb to determine what should be included in the scope of one set of Hexawise tests is to think about a verb and a noun. "Apply for" could be your verb. "A loan" might be your noun. If you have a lot of permutations in which a person could apply for a loan, those scenarios could all fall within the scope of that set of tests. If, however, you started to think about testing the contents of help files, it may well be useful to include those "help file-related" tests in a different set of tests.
Each test case in a single Hexawise test plan will often test the same functionality, but with different permutations. For example, those permutations might include variations of environment (IE or Firefox, using mouse or keyboard, etc.), user (new user, normal user, VIP customer, admin), data (Florida, New York, under 18, over 18) and actions (used the dropdown, keyed it in manually, clicked the confirmation checkbox). The parenthetical examples I provided here come from testing end user software, but the same applies to other types of systems.
If you're testing the same scope (same verb & noun), but identifying all the possible variations, your Auto-Script steps will be the same for all test cases. What might change, of course, is what the tester should expect to happen. Should they see an error dialog or a confirmation dialog? Should the border be green or blue? Should the user get an "X" email or a "Y" email? But we'll save that for another discussion.