No they are seperate passes. There is a deal going on right now where if you buy a fun pass for 1 than you Also get a fun pass for the other. As for the Annual pass there is a 3$ extra per month fee if you want to include another park to the pass.
If you have the annual pass or the fun pass, the answer will be yes you can.
I do but I have three regular Adventure Island but would like to go to Bush Gardens cause Adventure Island is closed ðŸ˜
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