華 and 畢 are very similar, the bottom is the same, and only the top 4/5 of their strokes differ.
Their simplifications 华 and 毕 are also similar, the bottom and the top rights are the same and, and the top lefts have the same number of strokes. Both tops now serve as phonetic components, but still look very similar.
Is this a coincidence or was there a strategy?