If your asparagus stems are thin, reduce cooking time to 1 minute* and check to see if they done. If they are very thin, cook for "0" minutes. They will cook while the pot is building pressure, then shut off.
You can cook any amount of asparagus for the same amount of time.
If you have an 8 quart or a 6 quart made after 2017 you may need to cook your asparagus for "0" minutes. The newer pots are much more temperamental and cook hotter than the original models.
Yes, any brand of pressure cooker will work, but I have not used any other brand and cannot guarantee your results will be the same or that you will have the same buttons…so think of these as guidelines.