I think you can reference the views as well provided you have the same. I think it gets tricky (impossible) when it's gets to the hardware. I had project a while back where I did an Android version first and then iOS. Only had to do some minimal changes to get it to work 99% identical on both platforms. Alas the $99/year fee and the rigmarole app deployment killed it off for me for iOS but, you'll probably find it alot easier from iOS to Android.
For the user interface it depends on which views you are using.
Several are similar and others are completly different or don't exist.
You may have a look at chapter 11 Differences B4i <> B4A in the B4i Behinner's Guide (link in my signature).