It depends on what you mean by visual differences. Will there be a difference in image quality? Maybe some marginal differences, depending on the source material and what you do with it in terms of effects etc. But it’s not like FCP or Avid or Vegas has better or worse video quality.
Will you make different edits, making your video’s look different? Well of course you will. Any tool will eventually have some effect on the final result. Is there a better or worse app for video editing? Of course not, these days the differences aren’t that big.
By editing actions, I presume you mean working with the interface. Any program has it’s own interface and it’s own logic, so yes there are substantial differences in how you perform the same tasks. If you’re just starting out, you’re lucky, because you get to learn from scratch. I’m switching from FCP to Vegas and most of my frustrations are with old habits, not with the new program.
I just hope you’re not used to editing in FCP and have a job coming up with Vegas next week. If so, I suggest you download the trial of Vegas, order a study book (Douglas Spotted Eagle wrote a fine one) and prepare for some short nights.
Greets,
A.