okay sharing a birthday with Casey is starting to freek me out! We have diffrent birth years though, someone tell me that makes a hudge diffrence!
That makes a huge difference.
Depending how close the years are between your birthday and Casey's, the outer planets can be closely aligned or very widely spaced and in different signs. Lots of things can be alike or they can be totally different.
What matters most, besides the year of birth, is the TIME of birth and the LOCATION of birth.
I nearly flipped when I I found out Angelina Jolie and I have many planets alike, including our suns, moons, and ascendants. We were born many years apart so of course there are differences. Funny thing though, Angelina moves frequently and owns many houses. My frequent moves, and several houses in different locations at the same time, drove my family and friends crazy. They couldn't keep up with me.
Oddly, my daughter and Angelina share the same birthday, albeit, different years, but they are only three years apart in age, and have very few planets alike, except their suns, and one or two outer planets. All these things make a huge difference in natal charts.
My sociopath step-daughter was born March 20, but several years before Casey, however, they could be identical twins in attitudes, activities, and those looks they get on their faces. And the lies!! As far as I know, step-d hasn't killed any of her children, but the ones she had, she gave away.
So unless you and Casey were born at the exact same time, place, and year, I think you are in the clear - unless you have serious sociopathic tendencies.
See Soulscape's excellent explanation on page 10.