A1 (5-click round) vs. A2 (4-click square) front sight posts

[Aero Denezol]

Are the A1 and A2 front sight posts interchangeable?

I usually buy a skinny match grade front post for my AR's but this is my first time with A1 upper, and the post is a round 5-click type. I'm not sure if anybody makes a skinny version of round 5-click type or whether I can swap with A2 type of front post.

Thanks in advance

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