All LSATs are made up of previous experimental sections. That's what they're used for! There isn't a major difference in the makeup of the February test. The difference is that it is non-disclosed, so you don't get your test back. You only have your score, so you'll have no idea what questions you got wrong. This is only harmful if you plan to retake, because you can review the test to help you improve.
The major benefit of the June exam is that it is in the afternoon, so if you're not a morning person (like me), then you can take it when you're brain is alert and ready.